21157816890

Names of 21157816890

• Cardinal: 21157816890 can be written as Twenty-one billion, one hundred fifty-seven million, eight hundred sixteen thousand, eight hundred ninety.

Scientific notation

• Scientific notation: 2.115781689 × 10¹⁰

Factors of 21157816890

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 38324

Divisors of 21157816890

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 5 6 7 10 14 15 19 21 30 35 38 42 57 70 95 105 114 133 139 190 210 266 278 285 399 417 570 665 695 798 834 973 1330 1390 1946 1995 2085 2641 2919 3990 4170 4865 5282 5838 7923 9730 13205 14595 15846 18487 26410 29190 36974 38149 39615 55461 76298 79230 92435 110922 114447 184870 190745 228894 267043 277305 381490 534086 554610 572235 724831 801129 1144470 1335215 1449662 1602258 2174493 2670430 3624155 4005645 4348986 5073817 5302711 7248310 8011290 10147634 10605422 10872465 15221451 15908133 21744930 25369085 26513555 30442902 31816266 37118977 50738170 53027110 74237954 76107255 79540665 100751509 111356931 152214510 159081330 185594885 201503018 222713862 302254527 371189770 503757545 556784655 604509054 705260563 1007515090 1113569310 1410521126 1511272635 2115781689 3022545270 3526302815 4231563378 7052605630 10578908445 21157816890
• Sum of all divisors σ(n): 61528320000
• Sum of proper divisors (its aliquot sum) s(n): 40370503110
• 21157816890 is an abundant number, because the sum of its proper divisors (40370503110) is greater than itself. Its abundance is 19212686220

Bases of 21157816890

• Binary: 10011101101000110101010101000111010₂
• Hexadecimal: 0x4ED1AAA3A
• Base-36: 9PWTFZU

Squares and roots of 21157816890

• 21157816890 squared (21157816890²) is 447653215550769272100
• 21157816890 cubed (21157816890³) is 9471364764842876757730385769000
• The square root of 21157816890 is 145457.2682611633
• The cube root of 21157816890 is 2765.8181233993

Scales and comparisons

• 21,157,816,890 seconds is equal to 672 years, 39 weeks, 1 day, 3 hours, 21 minutes, 30 seconds.
• To count from 1 to 21,157,816,890 would take you about one thousand, three hundred forty-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 21157816890 cubic inches would be around 230.5 feet tall.

Recreational maths with 21157816890

• 21157816890 backwards is 09861875112
• The number of decimal digits it has is: 11
• The sum of 21157816890's digits is 48
• More coming soon!