21397087840

Names of 21397087840

• Cardinal: 21397087840 can be written as Twenty-one billion, three hundred ninety-seven million, eighty-seven thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.139708784 × 10¹⁰

Factors of 21397087840

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 105

Divisors of 21397087840

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 4 5 8 10 16 20 31 32 40 62 67 80 124 134 155 160 248 268 310 335 496 536 620 670 961 992 1072 1240 1340 1922 2077 2144 2480 2680 3844 4154 4489 4805 4960 5360 7688 8308 8978 9610 10385 10720 15376 16616 17956 19220 20770 22445 29791 30752 33232 35912 38440 41540 44890 59582 64387 66464 71824 76880 83080 89780 119164 128774 139159 143648 148955 153760 166160 179560 238328 257548 278318 297910 321935 332320 359120 476656 515096 556636 595820 643870 695795 718240 953312 1030192 1113272 1191640 1287740 1391590 1995997 2060384 2226544 2383280 2575480 2783180 3991994 4313929 4453088 4766560 5150960 5566360 7983988 8627858 9979985 10301920 11132720 15967976 17255716 19959970 21569645 22265440 31935952 34511432 39919940 43139290 63871904 69022864 79839880 86278580 133731799 138045728 159679760 172557160 267463598 319359520 345114320 534927196 668658995 690228640 1069854392 1337317990 2139708784 2674635980 4279417568 5349271960 10698543920 21397087840
• Sum of all divisors σ(n): 53026856064
• Sum of proper divisors (its aliquot sum) s(n): 31629768224
• 21397087840 is an abundant number, because the sum of its proper divisors (31629768224) is greater than itself. Its abundance is 10232680384

Bases of 21397087840

• Binary: 10011111011010111011010011001100000₂
• Hexadecimal: 0x4FB5DA660
• Base-36: 9TV9UN4

Squares and roots of 21397087840

• 21397087840 squared (21397087840²) is 457835368032675865600
• 21397087840 cubed (21397087840³) is 9796343586053893486491234304000
• The square root of 21397087840 is 146277.4344866629
• The cube root of 21397087840 is 2776.2051563781

Scales and comparisons

• 21,397,087,840 seconds is equal to 680 years, 18 weeks, 5 days, 11 hours, 30 minutes, 40 seconds.
• To count from 1 to 21,397,087,840 would take you about one thousand, three hundred sixty 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 21397087840 cubic inches would be around 231.4 feet tall.

Recreational maths with 21397087840

• 21397087840 backwards is 04878079312
• The number of decimal digits it has is: 11
• The sum of 21397087840's digits is 49
• More coming soon!