21381218784

Names of 21381218784

• Cardinal: 21381218784 can be written as Twenty-one billion, three hundred eighty-one million, two hundred eighteen thousand, seven hundred eighty-four.

Scientific notation

• Scientific notation: 2.1381218784 × 10¹⁰

Factors of 21381218784

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 14
• Sum of prime factors: 118

Divisors of 21381218784

• Number of divisors d(n): 480
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 17 18 23 24 27 32 34 36 46 48 51 54 68 69 72 73 81 92 96 102 108 136 138 144 146 153 162 184 204 207 216 219 272 276 288 289 292 306 324 368 391 408 414 432 438 459 544 552 578 584 612 621 648 657 736 782 816 828 864 867 876 918 1104 1156 1168 1173 1224 1241 1242 1296 1314 1377 1564 1632 1656 1679 1734 1752 1836 1863 1971 2208 2312 2336 2346 2448 2482 2484 2592 2601 2628 2754 3128 3312 3358 3468 3504 3519 3672 3723 3726 3942 4624 4692 4896 4913 4964 4968 5037 5202 5256 5508 5913 6256 6624 6647 6716 6936 7008 7038 7344 7446 7452 7803 7884 9248 9384 9826 9928 9936 10074 10404 10512 10557 11016 11169 11826 12512 13294 13432 13872 14076 14688 14739 14892 14904 15111 15606 15768 18768 19652 19856 19872 19941 20148 20808 21024 21097 21114 22032 22338 23409 23652 26588 26864 27744 28152 28543 29478 29784 29808 30222 31212 31536 31671 33507 37536 39304 39712 39882 40296 41616 42194 42228 44064 44217 44676 45333 46818 47304 53176 53728 56304 57086 58956 59568 59616 59823 60444 62424 63072 63291 63342 67014 78608 79764 80592 83232 84388 84456 85629 88434 89352 90666 93636 94608 100521 106352 112608 112999 114172 117912 119136 119646 120888 124848 126582 126684 132651 134028 135999 157216 159528 161184 168776 168912 171258 176868 178704 179469 181332 187272 189216 189873 201042 212704 225998 228344 235824 239292 241776 249696 253164 253368 256887 265302 268056 271998 319056 337552 337824 338997 342516 353736 357408 358649 358938 362664 374544 379746 397953 402084 451996 456688 471648 478584 483552 485231 506328 506736 513774 530604 536112 538407 543996 569619 638112 675104 677994 685032 707472 717298 717876 725328 749088 759492 770661 795906 804168 903992 913376 957168 970462 1012656 1013472 1016991 1027548 1061208 1072224 1075947 1076814 1087992 1139238 1355988 1370064 1414944 1434596 1435752 1450656 1455693 1518984 1541322 1591812 1608336 1708857 1807984 1914336 1940924 2025312 2033982 2055096 2122416 2151894 2153628 2175984 2278476 2311983 2711976 2740128 2869192 2871504 2911386 3037968 3050973 3082644 3183624 3216672 3227841 3417714 3615968 3881848 4067964 4110192 4244832 4303788 4307256 4351968 4367079 4556952 4623966 5423952 5738384 5743008 5822772 6075936 6101946 6165288 6367248 6455682 6835428 7763696 8135928 8220384 8248927 8607576 8614512 8734158 9113904 9152919 9247932 9683523 10847904 11476768 11645544 12203892 12330576 12734496 12911364 13101237 13670856 15527392 16271856 16497854 17215152 17229024 17468316 18227808 18305838 18495864 19367046 23291088 24407784 24661152 24746781 25822728 26202474 27341712 29050569 32543712 32995708 34430304 34936632 36611676 36991728 38734092 39303711 46582176 48815568 49493562 51645456 52404948 54683424 58101138 65991416 69873264 73223352 73983456 74240343 77468184 78607422 97631136 98987124 103290912 104809896 116202276 131982832 139746528 146446704 148480686 154936368 157214844 197974248 209619792 222721029 232404552 263965664 292893408 296961372 309872736 314429688 395948496 419239584 445442058 464809104 593922744 628859376 668163087 791896992 890884116 929618208 1187845488 1257718752 1336326174 1781768232 2375690976 2672652348 3563536464 5345304696 7127072928 10690609392 21381218784
• Sum of all divisors σ(n): 70670698560
• Sum of proper divisors (its aliquot sum) s(n): 49289479776
• 21381218784 is an abundant number, because the sum of its proper divisors (49289479776) is greater than itself. Its abundance is 27908260992

Bases of 21381218784

• Binary: 10011111010011010111000000111100000₂
• Hexadecimal: 0x4FA6B81E0
• Base-36: 9TLTQ00

Squares and roots of 21381218784

• 21381218784 squared (21381218784²) is 457156516689274438656
• 21381218784 cubed (21381218784³) is 9774563501864724119122722914304
• The square root of 21381218784 is 146223.1814179955
• The cube root of 21381218784 is 2775.5186665287

Scales and comparisons

• 21,381,218,784 seconds is equal to 679 years, 44 weeks, 3 days, 19 hours, 26 minutes, 24 seconds.
• To count from 1 to 21,381,218,784 would take you about one thousand, three hundred fifty-nine 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 21381218784 cubic inches would be around 231.3 feet tall.

Recreational maths with 21381218784

• 21381218784 backwards is 48781218312
• The number of decimal digits it has is: 11
• The sum of 21381218784's digits is 45
• More coming soon!