21687921904

Names of 21687921904

• Cardinal: 21687921904 can be written as Twenty-one billion, six hundred eighty-seven million, nine hundred twenty-one thousand, nine hundred four.

Scientific notation

• Scientific notation: 2.1687921904 × 10¹⁰

Factors of 21687921904

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 823

Divisors of 21687921904

• Number of divisors d(n): 240
• Complete list of divisors:
  1 2 4 8 11 16 17 22 29 31 34 44 58 62 68 88 116 121 124 136 176 187 232 242 248 272 319 341 374 464 484 493 496 527 638 682 733 748 899 968 986 1054 1276 1364 1466 1496 1798 1936 1972 2057 2108 2552 2728 2932 2992 3509 3596 3751 3944 4114 4216 5104 5423 5456 5797 5864 7018 7192 7502 7888 8063 8228 8432 9889 10846 11594 11728 12461 14036 14384 15004 15283 16126 16456 19778 21257 21692 22723 23188 24922 28072 30008 30566 32252 32912 39556 42514 43384 45446 46376 49844 56144 59653 60016 61132 63767 64504 79112 85028 86768 88693 90892 92752 99688 108779 119306 122264 127534 129008 137071 158224 168113 170056 177386 181784 199376 217558 233827 238612 244528 249953 255068 274142 336226 340112 354772 361369 363568 386291 435116 467654 477224 499906 510136 548284 658967 672452 709544 722738 772582 870232 935308 954448 999812 1020272 1096568 1317934 1344904 1419088 1445476 1507781 1545164 1740464 1849243 1870616 1999624 2193136 2572097 2635868 2689808 2749483 2890952 3015562 3090328 3698486 3741232 3975059 3999248 4249201 5144194 5271736 5498966 5781904 6031124 6180656 7248637 7396972 7950118 8498402 10288388 10543472 10997932 11202439 12062248 14497274 14793944 15900236 16996804 20576776 21995864 22404878 24124496 28994548 29587888 31800472 33993608 41153552 43725649 43991728 44809756 46741211 57989096 63600944 67987216 79735007 87451298 89619512 93482422 115978192 123226829 159470014 174902596 179239024 186964844 246453658 318940028 349805192 373929688 492907316 637880056 699610384 747859376 985814632 1275760112 1355495119 1971629264 2710990238 5421980476 10843960952 21687921904
• Sum of all divisors σ(n): 52294152960
• Sum of proper divisors (its aliquot sum) s(n): 30606231056
• 21687921904 is an abundant number, because the sum of its proper divisors (30606231056) is greater than itself. Its abundance is 8918309152

Bases of 21687921904

• Binary: 10100001100101100110110110011110000₂
• Hexadecimal: 0x50CB36CF0
• Base-36: 9YOFFN4

Squares and roots of 21687921904

• 21687921904 squared (21687921904²) is 470365956514002985216
• 21687921904 cubed (21687921904³) is 10201260131175956825787474571264
• The square root of 21687921904 is 147268.1971913827
• The cube root of 21687921904 is 2788.7268637065

Scales and comparisons

• 21,687,921,904 seconds is equal to 689 years, 31 weeks, 4 days, 14 hours, 45 minutes, 4 seconds.
• To count from 1 to 21,687,921,904 would take you about one thousand, three hundred seventy-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 21687921904 cubic inches would be around 232.4 feet tall.

Recreational maths with 21687921904

• 21687921904 backwards is 40912978612
• The number of decimal digits it has is: 11
• The sum of 21687921904's digits is 49
• More coming soon!