21051570721

Names of 21051570721

• Cardinal: 21051570721 can be written as Twenty-one billion, fifty-one million, five hundred seventy thousand, seven hundred twenty-one.

Scientific notation

• Scientific notation: 2.1051570721 × 10¹⁰

Factors of 21051570721

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1777550

Divisors of 21051570721

• Number of divisors d(n): 4
• Complete list of divisors:
  1 11923 1765627 21051570721
• Sum of all divisors σ(n): 21053348272
• Sum of proper divisors (its aliquot sum) s(n): 1777551
• 21051570721 is a deficient number, because the sum of its proper divisors (1777551) is less than itself. Its deficiency is 21049793170

Bases of 21051570721

• Binary: 10011100110110001010111101000100001₂
• Hexadecimal: 0x4E6C57A21
• Base-36: 9O5K7XD

Squares and roots of 21051570721

• 21051570721 squared (21051570721²) is 443168629821264459841
• 21051570721 cubed (21051570721³) is 9329395752011018365986675915361
• The square root of 21051570721 is 145091.5942465311
• The cube root of 21051570721 is 2761.1807382837

Scales and comparisons

• 21,051,570,721 seconds is equal to 669 years, 19 weeks, 3 days, 10 hours, 32 minutes, 1 second.
• To count from 1 to 21,051,570,721 would take you about one thousand, three hundred thirty-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 21051570721 cubic inches would be around 230.1 feet tall.

Recreational maths with 21051570721

• 21051570721 backwards is 12707515012
• The number of decimal digits it has is: 11
• The sum of 21051570721's digits is 31
• More coming soon!