21878978121

Names of 21878978121

• Cardinal: 21878978121 can be written as Twenty-one billion, eight hundred seventy-eight million, nine hundred seventy-eight thousand, one hundred twenty-one.

Scientific notation

• Scientific notation: 2.1878978121 × 10¹⁰

Factors of 21878978121

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 88

Divisors of 21878978121

• Number of divisors d(n): 432
• Complete list of divisors:
  1 3 7 9 11 13 17 21 27 33 37 39 51 63 77 81 91 99 111 117 119 121 143 153 169 187 189 221 231 243 259 273 297 333 351 357 363 407 429 459 481 507 561 567 629 663 693 777 819 847 891 999 1001 1053 1071 1089 1183 1221 1287 1309 1377 1443 1521 1547 1573 1683 1701 1859 1887 1989 2057 2079 2331 2431 2457 2541 2673 2849 2873 2997 3003 3159 3213 3267 3367 3549 3663 3861 3927 4131 4329 4403 4477 4563 4641 4719 5049 5291 5577 5661 5967 6171 6237 6253 6919 6993 7293 7371 7623 8177 8547 8619 8991 9009 9639 9801 10101 10647 10989 11011 11583 11781 12987 13013 13209 13431 13689 13923 14157 14399 15147 15873 16731 16983 17017 17901 18513 18711 18759 20111 20449 20757 20979 21879 22113 22869 24531 25641 25857 26741 27027 28917 29403 30303 31339 31603 31941 32967 33033 34749 35343 37037 38961 39039 39627 40293 41067 41769 42471 43197 43771 45441 47619 48433 50193 50949 51051 53703 55539 56277 57239 58201 60333 61347 62271 62937 65637 68607 68783 73593 76109 76923 77571 80223 81081 89947 90909 94017 94809 95823 98901 99099 106029 106301 111111 116883 117117 118881 120879 125307 127413 129591 131313 142857 143143 145299 150579 152847 153153 166617 168831 171717 174603 180999 184041 186813 187187 196911 205821 206349 220779 221221 228327 230769 232713 240669 243243 269841 272727 282051 284427 287469 297297 318087 318903 333333 347633 351351 356643 362637 375921 382239 388773 393939 407407 428571 429429 435897 451737 459459 481481 499851 506493 515151 523809 532763 542997 552123 560439 561561 590733 619047 629629 662337 663663 684981 692307 698139 722007 744107 756613 809523 818181 846153 853281 891891 956709 989417 999999 1042899 1054053 1069929 1087911 1166319 1169311 1181817 1222221 1285713 1288287 1307691 1378377 1444443 1519479 1545453 1571427 1598289 1628991 1656369 1681317 1684683 1857141 1888887 1987011 1990989 2054943 2166021 2232321 2269839 2428569 2433431 2538459 2559843 2675673 2870127 2968251 2999997 3128697 3162159 3498957 3507933 3545451 3666663 3864861 3923073 4135131 4333329 4636359 4714281 4794867 4886973 4969107 5054049 5296291 5571423 5666661 5972967 6164829 6498063 6696963 6809517 6925919 7285707 7300293 7615377 7679529 8185177 8610381 8904753 8999991 9386091 10523799 10636353 10999989 11594583 11769219 12862421 12999987 13909077 14142843 14384601 15162147 15888873 16714269 16999983 17918901 18494487 20090889 20428551 20777757 21857121 21900879 24555531 25831143 26714259 28158273 31571397 32999967 34783749 38587263 38999961 43153803 45486441 47666619 50999949 53756703 60272667 61285653 62333271 65702637 73666593 80142777 84474819 90036947 94714191 98999901 115761789 116999883 129461409 142999857 152999847 180818001 183856959 186999813 197107911 220999779 240428331 270110841 284142573 347285367 428999571 560999439 591323733 662999337 810332523 1041856101 1286998713 1682998317 1988998011 2430997569 3125568303 7292992707 21878978121
• Sum of all divisors σ(n): 48478614912
• Sum of proper divisors (its aliquot sum) s(n): 26599636791
• 21878978121 is an abundant number, because the sum of its proper divisors (26599636791) is greater than itself. Its abundance is 4720658670

Bases of 21878978121

• Binary: 10100011000000101101011011001001001₂
• Hexadecimal: 0x51816B649
• Base-36: A1U6FK9

Squares and roots of 21878978121

• 21878978121 squared (21878978121²) is 478689683619196690641
• 21878978121 cubed (21878978121³) is 10473241114652816490130044465561
• The square root of 21878978121 is 147915.4424696759
• The cube root of 21878978121 is 2796.8918794027

Scales and comparisons

• 21,878,978,121 seconds is equal to 695 years, 35 weeks, 3 days, 21 hours, 55 minutes, 21 seconds.
• To count from 1 to 21,878,978,121 would take you about one thousand, three hundred ninety-one 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 21878978121 cubic inches would be around 233.1 feet tall.

Recreational maths with 21878978121

• 21878978121 backwards is 12187987812
• The number of decimal digits it has is: 11
• The sum of 21878978121's digits is 54
• More coming soon!