21781620672

Names of 21781620672

• Cardinal: 21781620672 can be written as Twenty-one billion, seven hundred eighty-one million, six hundred twenty thousand, six hundred seventy-two.

Scientific notation

• Scientific notation: 2.1781620672 × 10¹⁰

Factors of 21781620672

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 566

Divisors of 21781620672

• Number of divisors d(n): 448
• Complete list of divisors:
  1 2 3 4 6 7 8 12 14 16 19 21 24 28 29 32 38 42 48 56 57 58 64 67 76 84 87 96 112 114 116 133 134 152 168 174 192 201 203 224 228 232 266 268 304 336 348 399 402 406 439 448 456 464 469 532 536 551 608 609 672 696 798 804 812 878 912 928 938 1064 1072 1102 1216 1218 1273 1317 1344 1392 1407 1596 1608 1624 1653 1756 1824 1856 1876 1943 2128 2144 2204 2436 2546 2634 2784 2814 3073 3192 3216 3248 3306 3512 3648 3752 3819 3857 3886 4256 4288 4408 4872 5092 5268 5568 5628 5829 6146 6384 6432 6496 6612 7024 7504 7638 7714 7772 8341 8512 8816 8911 9219 9744 10184 10536 11256 11571 11658 12292 12731 12768 12864 12992 13224 13601 14048 15008 15276 15428 15544 16682 17632 17822 18438 19488 20368 21072 22512 23142 23316 24584 25023 25462 25536 26448 26733 27202 28096 29413 30016 30552 30856 31088 33364 35264 35644 36876 36917 38193 38976 40736 40803 42144 45024 46284 46632 49168 50046 50924 52896 53466 54404 58387 58826 61104 61712 62176 66728 71288 73752 73834 76386 81472 81606 84288 88239 89117 90048 92568 93264 98336 100092 101848 105792 106932 108808 110751 116774 117652 122208 123424 124352 133456 142576 147504 147668 152772 163212 175161 176478 178234 185136 186528 196672 200184 203696 205891 213864 217616 221502 233548 235304 241889 244416 246848 258419 266912 267351 285152 295008 295336 305544 326424 350322 352956 356468 370272 373056 400368 407392 411782 427728 435232 443004 467096 470608 483778 516838 533824 534702 558847 570304 590016 590672 611088 617673 652848 700644 705912 712936 725667 740544 775257 800736 814784 823564 852977 855456 870464 886008 934192 941216 967556 1033676 1069404 1117694 1181344 1222176 1235346 1305696 1401288 1411824 1425872 1451334 1550514 1601472 1647128 1676541 1693223 1705954 1710912 1772016 1868384 1882432 1935112 2067352 2138808 2235388 2362688 2444352 2470692 2558931 2611392 2802576 2823648 2851744 2902668 3101028 3294256 3353082 3386446 3411908 3544032 3736768 3870224 3911929 4134704 4277616 4470776 4941384 5079669 5117862 5605152 5647296 5703488 5805336 5970839 6202056 6588512 6706164 6772892 6823816 7088064 7740448 7823858 8269408 8555232 8941552 9882768 10159338 10235724 11210304 11610672 11735787 11941678 12404112 13177024 13412328 13545784 13647632 15480896 15647716 16206563 16538816 17110464 17883104 17912517 19765536 20318676 20471448 23221344 23471574 23883356 24808224 26824656 27091568 27295264 31295432 32413126 35766208 35825034 39531072 40637352 40942896 46442688 46943148 47766712 48619689 49616448 53649312 54183136 54590528 62590864 64826252 71650068 81274704 81885792 93886296 95533424 97239378 107298624 108366272 113445941 125181728 129652504 143300136 162549408 163771584 187772592 191066848 194478756 226891882 250363456 259305008 286600272 325098816 340337823 375545184 382133696 388957512 453783764 518610016 573200544 680675646 751090368 777915024 907567528 1037220032 1146401088 1361351292 1555830048 1815135056 2722702584 3111660096 3630270112 5445405168 7260540224 10890810336 21781620672
• Sum of all divisors σ(n): 72956928000
• Sum of proper divisors (its aliquot sum) s(n): 51175307328
• 21781620672 is an abundant number, because the sum of its proper divisors (51175307328) is greater than itself. Its abundance is 29393686656

Bases of 21781620672

• Binary: 10100010010010010010010011111000000₂
• Hexadecimal: 0x5124927C0
• Base-36: A087Q2O

Squares and roots of 21781620672

• 21781620672 squared (21781620672²) is 474438999098897731584
• 21781620672 cubed (21781620672³) is 10334050310375540202683961704448
• The square root of 21781620672 is 147585.9772200597
• The cube root of 21781620672 is 2792.7371583593

Scales and comparisons

• 21,781,620,672 seconds is equal to 692 years, 30 weeks, 4 days, 2 hours, 11 minutes, 12 seconds.
• To count from 1 to 21,781,620,672 would take you about one thousand, three hundred eighty-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 21781620672 cubic inches would be around 232.7 feet tall.

Recreational maths with 21781620672

• 21781620672 backwards is 27602618712
• 21781620672 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21781620672's digits is 42
• More coming soon!