21018209940

Names of 21018209940

• Cardinal: 21018209940 can be written as Twenty-one billion, eighteen million, two hundred nine thousand, nine hundred forty.

Scientific notation

• Scientific notation: 2.101820994 × 10¹⁰

Factors of 21018209940

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 102

Divisors of 21018209940

• Number of divisors d(n): 960
• Complete list of divisors:
  1 2 3 4 5 6 7 9 10 12 13 14 15 18 20 21 26 27 28 29 30 35 36 39 42 43 45 49 52 54 58 60 63 65 70 78 84 86 87 90 91 98 105 108 116 117 126 129 130 135 140 145 147 156 172 174 180 182 189 195 196 203 210 215 234 245 252 258 260 261 270 273 290 294 301 315 343 348 351 364 377 378 387 390 406 420 430 435 441 455 468 490 516 522 540 546 559 580 585 588 602 609 630 637 645 686 702 735 754 756 774 780 783 812 819 860 870 882 903 910 945 980 1015 1029 1044 1092 1118 1131 1161 1170 1204 1218 1247 1260 1274 1290 1305 1323 1365 1372 1404 1421 1470 1505 1508 1548 1566 1638 1677 1715 1740 1755 1764 1806 1820 1827 1885 1890 1911 1935 2030 2058 2107 2205 2236 2262 2322 2340 2401 2436 2457 2494 2548 2580 2610 2639 2646 2709 2730 2795 2842 2940 3010 3045 3087 3132 3185 3276 3354 3393 3430 3510 3612 3654 3741 3770 3780 3822 3870 3913 3915 4060 4095 4116 4214 4263 4410 4459 4515 4524 4644 4802 4914 4988 5031 5145 5220 5278 5292 5418 5460 5481 5590 5655 5684 5733 5805 6020 6090 6174 6235 6321 6370 6615 6708 6786 6860 7020 7105 7203 7308 7482 7540 7644 7740 7826 7830 7917 8127 8190 8385 8428 8526 8729 8820 8918 9030 9135 9261 9555 9604 9828 9947 10062 10179 10290 10535 10556 10836 10962 11180 11223 11310 11466 11610 11739 12005 12180 12285 12348 12470 12642 12740 12789 13195 13230 13377 13545 13572 14210 14406 14749 14964 15093 15435 15652 15660 15834 16211 16254 16380 16770 16965 17052 17199 17458 17836 18060 18270 18473 18522 18705 18963 19110 19565 19894 20124 20358 20580 21070 21315 21609 21924 22295 22446 22620 22932 23220 23478 23751 24010 24570 24940 25155 25284 25578 26187 26390 26460 26754 27090 27391 27405 28420 28665 28812 29498 29841 30186 30870 31213 31605 31668 32422 32508 33540 33669 33930 34398 34916 35217 36015 36540 36946 37044 37410 37926 38220 38367 39130 39585 39788 40131 40635 40716 42140 42630 43218 43645 44247 44590 44892 46305 46956 47502 48020 48633 49140 49735 50310 50895 51156 52374 52780 53508 54180 54782 54810 55419 56115 56889 57330 58695 58996 59682 60372 61103 61740 62426 63210 63945 64827 64844 66885 67338 67860 68796 69629 70434 71253 72030 73745 73892 74820 75465 75852 76734 78260 78561 79170 80262 81055 81270 82173 85260 85995 86436 87290 88494 89180 89523 92365 92610 93639 94815 95004 97266 99470 100620 101790 103243 104748 105651 108045 109564 109620 110838 112230 113477 113778 114660 117390 118755 119364 120393 122206 124852 126420 127890 129311 129654 130935 132741 133770 134676 136955 139258 140868 142506 144060 145899 147490 149205 150930 153468 156065 157122 158340 160524 162110 162540 164346 166257 168345 171990 174580 176085 176988 179046 183309 184730 185220 187278 189630 191737 191835 194532 198940 200655 203580 206486 208887 211302 216090 221235 221676 224460 226954 227556 234780 235683 237510 240786 243165 244412 246519 255780 258622 259308 261870 265482 267540 268569 273910 277095 278516 280917 284445 285012 291798 294980 298410 301860 305515 309729 312130 314244 324135 324220 328692 332514 336690 340431 343980 348145 352170 356265 358092 366618 369460 374556 379260 383474 383670 387933 392805 398223 401310 410865 412972 417774 422604 427721 432180 437697 442470 447615 453908 468195 471366 475020 481572 486330 493038 498771 516215 517244 523740 528255 530964 537138 547820 549927 554190 561834 567385 568890 575211 583596 596820 601965 611030 619458 624260 626661 646555 648270 663705 665028 673380 680862 696290 704340 712530 729495 733236 739557 766948 767340 775866 785610 794339 796446 802620 821730 831285 835548 842751 855442 875394 884940 895230 905177 916545 929187 936390 942732 958685 972660 986076 997542 1021293 1032430 1044435 1056510 1074276 1099854 1108380 1123668 1134770 1137780 1150422 1163799 1178415 1203930 1222060 1232595 1238916 1253322 1283163 1293110 1296540 1327410 1342159 1342845 1361724 1392580 1404585 1425060 1458990 1479114 1548645 1551732 1571220 1588678 1592892 1643460 1649781 1662570 1685502 1702155 1710884 1725633 1750788 1790460 1810354 1833090 1858374 1872780 1879983 1917370 1939665 1991115 1995084 2042586 2064860 2088870 2113020 2138605 2188485 2199708 2269540 2300844 2327598 2356830 2383017 2407860 2465190 2493855 2506644 2566326 2586220 2654820 2684318 2685690 2715531 2749635 2787561 2809170 2876055 2917980 2958228 2994047 3063879 3097290 3133305 3177356 3299562 3325140 3371004 3404310 3451266 3491397 3620708 3666180 3697785 3716748 3759966 3834740 3849489 3879330 3971695 3982230 4026477 4085172 4177740 4213755 4277210 4376970 4525885 4645935 4655196 4713660 4766034 4930380 4987710 5106465 5132652 5176899 5368636 5371380 5431062 5499270 5560373 5575122 5618340 5752110 5818995 5988094 6127758 6194580 6266610 6415815 6599124 6710795 6808620 6902532 6982794 7149051 7395570 7519932 7698978 7758660 7943390 7964460 8052954 8146593 8248905 8427510 8554420 8628165 8753940 8982141 9051770 9291870 9399915 9532068 9975420 10212930 10353798 10862124 10998540 11120746 11150244 11504220 11548467 11637990 11915085 11976188 12079431 12255516 12533220 12831630 13421590 13577655 13937805 13965588 14298102 14791140 14970235 15319395 15397956 15886780 16105908 16293186 16497810 16681119 16855020 17256330 17456985 17964282 18103540 18583740 18799830 19247445 20132385 20425860 20707596 21447153 22241492 23096934 23275980 23830170 24158862 24439779 25663260 25884495 26843180 26946423 27155310 27801865 27875610 28596204 29940470 30638790 32586372 32995620 33362238 34512660 34913970 35745255 35928564 36238293 37599660 38494890 38922611 40264770 40732965 42894306 44910705 46193868 47660340 48317724 48879558 50043357 51768990 53892846 54310620 55603730 55751220 57742335 59880940 60397155 61277580 66724476 69827940 71490510 72476586 76989780 77845222 80529540 80839269 81465930 83405595 85788612 89821410 97759116 100086714 103537980 107235765 107785692 111207460 115484670 116767833 120794310 122198895 134732115 142981020 144953172 150130071 155690444 161678538 162931860 166811190 179642820 181191465 194613055 200173428 214471530 230969340 233535666 241588620 244397790 250216785 269464230 300260142 323357076 333622380 350303499 362382930 389226110 404196345 428943060 467071332 488795580 500433570 538928460 583839165 600520284 700606998 724765860 750650355 778452220 808392690 1000867140 1050910497 1167678330 1401213996 1501300710 1616785380 1751517495 2101820994 2335356660 3002601420 3503034990 4203641988 5254552485 7006069980 10509104970 21018209940
• Sum of all divisors σ(n): 86960966400
• Sum of proper divisors (its aliquot sum) s(n): 65942756460
• 21018209940 is an abundant number, because the sum of its proper divisors (65942756460) is greater than itself. Its abundance is 44924546520

Bases of 21018209940

• Binary: 10011100100110010000110111010010100₂
• Hexadecimal: 0x4E4C86E94
• Base-36: 9NLP6L0

Squares and roots of 21018209940

• 21018209940 squared (21018209940²) is 441765149081914803600
• 21018209940 cubed (21018209940³) is 9285112647579083599258667784000
• The square root of 21018209940 is 144976.5841092967
• The cube root of 21018209940 is 2759.7214038263

Scales and comparisons

• 21,018,209,940 seconds is equal to 668 years, 16 weeks, 2 days, 7 hours, 39 minutes.
• To count from 1 to 21,018,209,940 would take you about one thousand, three hundred thirty-six years!

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 21018209940 cubic inches would be around 230 feet tall.

Recreational maths with 21018209940

• 21018209940 backwards is 04990281012
• 21018209940 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21018209940's digits is 36
• More coming soon!