21001388940

Names of 21001388940

• Cardinal: 21001388940 can be written as Twenty-one billion, one million, three hundred eighty-eight thousand, nine hundred forty.

Scientific notation

• Scientific notation: 2.100138894 × 10¹⁰

Factors of 21001388940

• Number of distinct prime factors ω(n): 8
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 323

Divisors of 21001388940

• Number of divisors d(n): 768
• Complete list of divisors:
  1 2 3 4 5 6 7 9 10 12 14 15 17 18 19 20 21 27 28 30 34 35 36 38 42 45 51 54 57 60 63 68 70 76 84 85 90 95 102 103 105 108 114 119 126 133 135 140 153 167 170 171 180 189 190 204 206 210 228 238 252 255 266 270 285 306 309 315 323 334 340 342 357 378 380 399 412 420 459 476 501 510 513 515 532 540 570 595 612 618 630 646 665 668 684 714 721 756 765 798 835 855 918 927 945 969 1002 1020 1026 1030 1071 1140 1169 1190 1197 1236 1260 1292 1330 1428 1442 1503 1530 1545 1596 1615 1670 1710 1751 1785 1836 1854 1890 1938 1957 1995 2004 2052 2060 2142 2163 2261 2295 2338 2380 2394 2505 2565 2660 2781 2839 2884 2907 3006 3060 3090 3173 3213 3230 3340 3420 3502 3507 3570 3591 3605 3708 3780 3876 3914 3990 4284 4326 4509 4522 4590 4635 4676 4788 4845 5010 5130 5253 5355 5562 5678 5814 5845 5871 5985 6012 6180 6346 6426 6460 6489 6783 7004 7014 7140 7182 7210 7515 7828 7980 8517 8652 8721 8755 9018 9044 9180 9270 9519 9690 9785 10020 10260 10506 10521 10710 10815 11124 11305 11356 11628 11690 11742 11970 12257 12692 12852 12978 13566 13699 13905 14028 14195 14364 14420 14535 15030 15759 15865 16065 17034 17201 17442 17510 17535 17613 17955 18036 18540 19038 19380 19467 19570 19873 20349 21012 21042 21420 21630 22211 22545 22610 23380 23484 23940 24514 25551 25956 26265 27132 27398 27810 28390 28557 29070 29355 30060 31518 31563 31730 32130 32445 33269 33915 34068 34402 34884 35020 35070 35226 35910 36771 38076 38934 39140 39746 40698 41097 42084 42585 43260 43605 44422 45090 45220 47277 47595 49028 51102 51603 52530 52605 52839 53941 54796 55620 56780 57114 58140 58710 59619 61047 61285 63036 63126 63460 64260 64890 66538 66633 67830 68495 68804 70140 70452 71820 73542 76653 77868 78795 79492 81396 82194 85170 85671 86005 87210 88065 88844 90180 94554 95190 97335 99365 99807 101745 102204 103206 105060 105210 105678 107882 110313 111055 114228 117420 119238 120407 122094 122570 123291 126252 127755 129780 133076 133266 135660 136990 142785 147084 153306 154809 157590 157815 161823 164388 166345 170340 171342 172010 174420 176130 178857 183855 189108 190380 194670 198730 199614 199899 203490 205485 206412 210420 211356 215764 220626 222110 232883 236385 238476 240814 244188 245140 246582 255510 258015 264195 266532 269705 273980 285570 292417 298095 299421 305235 306612 309618 315180 315630 323646 326819 330939 332690 333165 342684 344020 352260 357714 361221 367710 369873 377587 383265 389340 397460 399228 399798 406980 410970 428355 441252 444220 464427 465766 472770 481628 485469 493164 499035 511020 516030 528390 536571 539410 551565 571140 584834 596190 598842 599697 602035 610470 616455 619236 631260 647292 653638 661878 665380 666330 698649 715428 722442 735420 739746 755174 766530 774045 799596 809115 821940 856710 877251 894285 898263 928854 931532 945540 970938 980457 998070 999495 1032060 1056780 1073142 1078820 1083663 1103130 1132761 1164415 1169668 1192380 1197684 1199394 1204070 1220940 1232910 1307276 1323756 1332660 1397298 1444884 1456407 1462085 1479492 1497105 1510348 1533060 1548090 1618230 1634095 1654695 1713420 1754502 1788570 1796526 1806105 1849365 1857708 1887935 1941876 1960914 1996140 1998990 2046919 2095947 2146284 2167326 2206260 2265522 2287733 2322135 2328830 2398788 2408140 2427345 2465820 2631753 2682855 2794596 2912814 2924170 2941371 2994210 2998485 3096180 3236460 3250989 3268190 3309390 3398283 3493245 3509004 3577140 3593052 3612210 3698730 3775870 3921828 3997980 4093838 4191894 4334652 4386255 4491315 4531044 4575466 4644270 4657660 4854690 4902285 5263506 5365710 5418315 5555923 5663805 5825628 5848340 5882742 5988420 5996970 6140757 6287841 6501978 6536380 6618780 6796566 6863199 6986490 7224420 7282035 7397460 7551740 7895259 8187676 8383788 8772510 8824113 8982630 9150932 9288540 9709380 9804570 10194849 10234595 10479735 10527012 10731420 10836630 11111846 11327610 11438665 11765484 11993940 12281514 12575682 13003956 13158765 13593132 13726398 13972980 14564070 14706855 15790518 16254945 16667769 16991415 17545020 17648226 17965260 18422271 19609140 20389698 20469190 20589597 20959470 21673260 22223692 22655220 22877330 24563028 25151364 26317530 27452796 27779615 29128140 29413710 30703785 31439205 31581036 32509890 33335538 33982830 34315995 35296452 36844542 38891461 39476295 40779396 40938380 41179194 41918940 44120565 45754660 50003307 50974245 52635060 55266813 55559230 58827420 61407570 61768791 62878410 65019780 66671076 67965660 68631990 73689084 77782922 78952590 82358388 83338845 88241130 92111355 100006614 101948490 102947985 110533626 111118460 116674383 122815140 123537582 125756820 137263980 150009921 155565844 157905180 166677690 176482260 184222710 194457305 200013228 203896980 205895970 221067252 233348766 247075164 250016535 276334065 300019842 308843955 333355380 350023149 368445420 388914610 411791940 466697532 500033070 552668130 583371915 600039684 617687910 700046298 750049605 777829220 1000066140 1050069447 1105336260 1166743830 1235375820 1400092596 1500099210 1750115745 2100138894 2333487660 3000198420 3500231490 4200277788 5250347235 7000462980 10500694470 21001388940
• Sum of all divisors σ(n): 84536524800
• Sum of proper divisors (its aliquot sum) s(n): 63535135860
• 21001388940 is an abundant number, because the sum of its proper divisors (63535135860) is greater than itself. Its abundance is 42533746920

Bases of 21001388940

• Binary: 10011100011110001111100001110001100₂
• Hexadecimal: 0x4E3C7C38C
• Base-36: 9NBONF0

Squares and roots of 21001388940

• 21001388940 squared (21001388940²) is 441058337409154323600
• 21001388940 cubed (21001388940³) is 9262837689159401866406220984000
• The square root of 21001388940 is 144918.5596809465
• The cube root of 21001388940 is 2758.9850001219

Scales and comparisons

• 21,001,388,940 seconds is equal to 667 years, 40 weeks, 3 days, 15 hours, 9 minutes.
• To count from 1 to 21,001,388,940 would take you about one thousand, three hundred thirty-five 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 21001388940 cubic inches would be around 229.9 feet tall.

Recreational maths with 21001388940

• 21001388940 backwards is 04988310012
• 21001388940 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21001388940's digits is 36
• More coming soon!