21,281 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21281 look like?

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

21281 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 21281:

13 × 1637

See below for interesting mathematical facts about the number 21281 from the Numbermatics database.

Names of 21281

  • Cardinal: 21281 can be written as Twenty-one thousand, two hundred eighty-one.

Scientific notation

  • Scientific notation: 2.1281 × 104

Factors of 21281

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 1650

Divisors of 21281

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 22932
  • Sum of proper divisors (its aliquot sum) s(n): 1651
  • 21281 is a deficient number, because the sum of its proper divisors (1651) is less than itself. Its deficiency is 19630

Bases of 21281

  • Binary: 1010011001000012
  • Hexadecimal: 0x5321
  • Base-36: GF5

Squares and roots of 21281

  • 21281 squared (212812) is 452880961
  • 21281 cubed (212813) is 9637759731041
  • The square root of 21281 is 145.8800877433
  • The cube root of 21281 is 27.7117537125

Scales and comparisons

How big is 21281?
  • 21,281 seconds is equal to 5 hours, 54 minutes, 41 seconds.
  • To count from 1 to 21,281 would take you about five 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 21281 cubic inches would be around 2.3 feet tall.

Recreational maths with 21281

  • 21281 backwards is 18212
  • The number of decimal digits it has is: 5
  • The sum of 21281's digits is 14
  • More coming soon!

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The information we have on file for 21281 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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