21,125 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21125 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 12 divisors.

21125 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of twelve divisors.

Prime factorization of 21125:

53 × 132

(5 × 5 × 5 × 13 × 13)

See below for interesting mathematical facts about the number 21125 from the Numbermatics database.

Names of 21125

  • Cardinal: 21125 can be written as Twenty-one thousand, one hundred twenty-five.

Scientific notation

  • Scientific notation: 2.1125 × 104

Factors of 21125

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 5
  • Sum of prime factors: 18

Divisors of 21125

  • Number of divisors d(n): 12
  • Complete list of divisors:
  • Sum of all divisors σ(n): 28548
  • Sum of proper divisors (its aliquot sum) s(n): 7423
  • 21125 is a deficient number, because the sum of its proper divisors (7423) is less than itself. Its deficiency is 13702

Bases of 21125

  • Binary: 1010010100001012
  • Hexadecimal: 0x5285
  • Base-36: GAT

Squares and roots of 21125

  • 21125 squared (211252) is 446265625
  • 21125 cubed (211253) is 9427361328125
  • The square root of 21125 is 145.3444185375
  • The cube root of 21125 is 27.6438740683

Scales and comparisons

How big is 21125?
  • 21,125 seconds is equal to 5 hours, 52 minutes, 5 seconds.
  • To count from 1 to 21,125 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 21125 cubic inches would be around 2.3 feet tall.

Recreational maths with 21125

  • 21125 backwards is 52112
  • The number of decimal digits it has is: 5
  • The sum of 21125's digits is 11
  • More coming soon!

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The information we have on file for 21125 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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