21818681920

Names of 21818681920

• Cardinal: 21818681920 can be written as Twenty-one billion, eight hundred eighteen million, six hundred eighty-one thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 2.181868192 × 10¹⁰

Factors of 21818681920

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 512690

Divisors of 21818681920

• Number of divisors d(n): 112
• Complete list of divisors:
  1 2 4 5 7 8 10 14 16 19 20 28 32 35 38 40 56 64 70 76 80 95 112 133 140 152 160 190 224 266 280 304 320 380 448 532 560 608 665 760 1064 1120 1216 1330 1520 2128 2240 2660 3040 4256 5320 6080 8512 10640 21280 42560 512657 1025314 2050628 2563285 3588599 4101256 5126570 7177198 8202512 9740483 10253140 14354396 16405024 17942995 19480966 20506280 28708792 32810048 35885990 38961932 41012560 48702415 57417584 68183381 71771980 77923864 82025120 97404830 114835168 136366762 143543960 155847728 164050240 194809660 229670336 272733524 287087920 311695456 340916905 389619320 545467048 574175840 623390912 681833810 779238640 1090934096 1148351680 1363667620 1558477280 2181868192 2727335240 3116954560 4363736384 5454670480 10909340960 21818681920
• Sum of all divisors σ(n): 62503263360
• Sum of proper divisors (its aliquot sum) s(n): 40684581440
• 21818681920 is an abundant number, because the sum of its proper divisors (40684581440) is greater than itself. Its abundance is 18865899520

Bases of 21818681920

• Binary: 10100010100011111101010101001000000₂
• Hexadecimal: 0x5147EAA40
• Base-36: A0UA2PS

Squares and roots of 21818681920

• 21818681920 squared (21818681920²) is 476054880726134886400
• 21818681920 cubed (21818681920³) is 10386890019027075717376933888000
• The square root of 21818681920 is 147711.4820181561
• The cube root of 21818681920 is 2794.3202006043

Scales and comparisons

• 21,818,681,920 seconds is equal to 693 years, 39 weeks, 6 days, 58 minutes, 40 seconds.
• To count from 1 to 21,818,681,920 would take you about one thousand, three hundred eighty-seven 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 21818681920 cubic inches would be around 232.9 feet tall.

Recreational maths with 21818681920

• 21818681920 backwards is 02918681812
• The number of decimal digits it has is: 11
• The sum of 21818681920's digits is 46
• More coming soon!