21020978979

Names of 21020978979

• Cardinal: 21020978979 can be written as Twenty-one billion, twenty million, nine hundred seventy-eight thousand, nine hundred seventy-nine.

Scientific notation

• Scientific notation: 2.1020978979 × 10¹⁰

Factors of 21020978979

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 71

Divisors of 21020978979

• Number of divisors d(n): 360
• Complete list of divisors:
  1 3 7 9 11 13 21 27 33 37 39 49 63 77 81 91 99 111 117 121 143 147 169 189 231 259 273 297 333 343 351 363 407 429 441 481 507 539 567 637 693 777 819 847 891 999 1001 1029 1053 1089 1183 1221 1287 1323 1443 1521 1573 1617 1813 1859 1911 2079 2331 2457 2541 2849 2997 3003 3087 3267 3367 3549 3663 3773 3861 3969 4329 4459 4477 4563 4719 4851 5291 5439 5577 5733 5929 6237 6253 6993 7007 7371 7623 8281 8547 9009 9261 9801 10101 10647 10989 11011 11319 11583 12691 12987 13013 13377 13431 13689 14157 14553 15873 16317 16731 17199 17787 18759 19943 20449 20979 21021 22869 23569 24843 25641 27027 27783 30303 31339 31941 32967 33033 33957 37037 38073 38961 39039 40131 40293 41503 42471 43659 43771 47619 48951 49049 50193 51597 53361 56277 57967 58201 59829 61347 63063 68607 68783 70707 74529 76923 77077 81081 90909 91091 94017 95823 99099 101871 111111 114219 117117 120393 120879 124509 127413 131313 139601 142857 143143 146853 147147 150579 160083 164983 168831 173901 174603 179487 184041 189189 206349 212121 219373 223587 230769 231231 259259 272727 273273 282051 297297 305613 306397 333333 342657 351351 361179 362637 373527 393939 407407 418803 428571 429429 441441 480249 481481 494949 506493 521703 523809 538461 539539 552123 567567 619047 636363 637637 658119 670761 693693 756613 777777 819819 846153 891891 919191 999999 1002001 1027971 1054053 1120581 1181817 1222221 1256409 1288287 1324323 1444443 1484847 1535611 1565109 1571427 1615383 1618617 1656369 1814813 1857141 1909089 1912911 1974357 2081079 2144779 2269839 2333331 2459457 2538459 2757573 2851849 2999997 3006003 3361743 3370367 3545451 3666663 3769227 3864861 3972969 4333329 4454541 4606833 4695327 4714281 4855851 5296291 5444439 5571423 5738733 5923071 6243237 6434337 6809517 6999993 7014007 7378371 8272719 8555547 9018009 10111101 10999989 11307681 11594583 12999987 13363623 13820499 14567553 15888873 16333317 17216199 17769213 19303011 19962943 20428551 20999979 21042021 23592569 24818157 25666641 27054027 30333303 32999967 37074037 38999961 41461497 43702659 47666619 48999951 51648597 57909033 59888829 61285653 63126063 70777707 76999923 81162081 90999909 111222111 124384491 142999857 146999853 173727099 179666487 189378189 212333121 230999769 259518259 272999727 333666333 428999571 538999461 568134567 636999363 778554777 1000998999 1616998383 1910998089 2335664331 3002996997 7006992993 21020978979
• Sum of all divisors σ(n): 44764288800
• Sum of proper divisors (its aliquot sum) s(n): 23743309821
• 21020978979 is an abundant number, because the sum of its proper divisors (23743309821) is greater than itself. Its abundance is 2722330842

Bases of 21020978979

• Binary: 10011100100111100101010111100100011₂
• Hexadecimal: 0x4E4F2AF23
• Base-36: 9NNCJ6R

Squares and roots of 21020978979

• 21020978979 squared (21020978979²) is 441881557235559882441
• 21020978979 cubed (21020978979³) is 9288782925856489640087972207739
• The square root of 21020978979 is 144986.1337473347
• The cube root of 21020978979 is 2759.8425914483

Scales and comparisons

• 21,020,978,979 seconds is equal to 668 years, 20 weeks, 6 days, 8 hours, 49 minutes, 39 seconds.
• To count from 1 to 21,020,978,979 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 21020978979 cubic inches would be around 230 feet tall.

Recreational maths with 21020978979

• 21020978979 backwards is 97987902012
• The number of decimal digits it has is: 11
• The sum of 21020978979's digits is 54
• More coming soon!