21731

21,731 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21731 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

21731 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 21731:

31 × 701

See below for interesting mathematical facts about the number 21731 from the Numbermatics database.


Names of 21731

  • Cardinal: 21731 can be written as Twenty-one thousand, seven hundred thirty-one.

Scientific notation

  • Scientific notation: 2.1731 × 104

Factors of 21731

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 732

Divisors of 21731

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 22464
  • Sum of proper divisors (its aliquot sum) s(n): 733
  • 21731 is a deficient number, because the sum of its proper divisors (733) is less than itself. Its deficiency is 20998

Bases of 21731

  • Binary: 1010100111000112
  • Hexadecimal: 0x54E3
  • Base-36: GRN

Squares and roots of 21731

  • 21731 squared (217312) is 472236361
  • 21731 cubed (217313) is 10262168360891
  • The square root of 21731 is 147.4143819305
  • The cube root of 21731 is 27.9057203191

Scales and comparisons

How big is 21731?
  • 21,731 seconds is equal to 6 hours, 2 minutes, 11 seconds.
  • To count from 1 to 21,731 would take you about six hours.

    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 21731 cubic inches would be around 2.3 feet tall.

Recreational maths with 21731

  • 21731 backwards is 13712
  • The number of decimal digits it has is: 5
  • The sum of 21731's digits is 14
  • More coming soon!

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The information we have on file for 21731 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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