21397780490985

Names of 21397780490985

• Cardinal: 21397780490985 can be written as Twenty-one trillion, three hundred ninety-seven billion, seven hundred eighty million, four hundred ninety thousand, nine hundred eighty-five.

Scientific notation

• Scientific notation: 2.1397780490985 × 10¹³

Factors of 21397780490985

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 8984

Divisors of 21397780490985

• Number of divisors d(n): 64
• Complete list of divisors:
  1 3 5 9 15 27 45 135 263 789 1315 2367 3945 7101 8713 11835 26139 35505 43565 69169 78417 130695 207507 235251 345845 392085 622521 1037535 1176255 1867563 2291519 3112605 6874557 9337815 11457595 18191447 20623671 34372785 54574341 61871013 90957235 103118355 163723023 272871705 309355065 491169069 602669497 818615115 1808008491 2455845345 3013347485 5424025473 9040042455 16272076419 27120127365 81360382095 158502077711 475506233133 792510388555 1426518699399 2377531165665 4279556098197 7132593496995 21397780490985
• Sum of all divisors σ(n): 38190073996800
• Sum of proper divisors (its aliquot sum) s(n): 16792293505815
• 21397780490985 is a deficient number, because the sum of its proper divisors (16792293505815) is less than itself. Its deficiency is 4605486985170

Bases of 21397780490985

• Binary: 100110111011000001111000110101110101011101001₂
• Hexadecimal: 0x13760F1AEAE9
• Base-36: 7L20612W9

Squares and roots of 21397780490985

• 21397780490985 squared (21397780490985²) is 457865009940378267666270225
• 21397780490985 cubed (21397780490985³) is 9797294977206879193880587445224186421625
• The square root of 21397780490985 is 4625773.5019113289
• The cube root of 21397780490985 is 27762.3511248717

Scales and comparisons

• 21,397,780,490,985 seconds is equal to 680,383 years, 12 weeks, 10 hours, 9 minutes, 45 seconds.
• To count from 1 to 21,397,780,490,985 would take you about one million, seven hundred thousand, nine hundred fifty-eight 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 21397780490985 cubic inches would be around 2313.5 feet tall.

Recreational maths with 21397780490985

• 21397780490985 backwards is 58909408779312
• The number of decimal digits it has is: 14
• The sum of 21397780490985's digits is 72
• More coming soon!