21456

21,456 is an even composite number composed of three prime numbers multiplied together.

What does the number 21456 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 30 divisors.

21456 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of thirty divisors.

Prime factorization of 21456:

24 × 32 × 149

(2 × 2 × 2 × 2 × 3 × 3 × 149)

See below for interesting mathematical facts about the number 21456 from the Numbermatics database.


Names of 21456

  • Cardinal: 21456 can be written as Twenty-one thousand, four hundred fifty-six.

Scientific notation

  • Scientific notation: 2.1456 × 104

Factors of 21456

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 7
  • Sum of prime factors: 154

Divisors of 21456

Bases of 21456

  • Binary: 1010011110100002
  • Hexadecimal: 0x53D0
  • Base-36: GK0

Squares and roots of 21456

  • 21456 squared (214562) is 460359936
  • 21456 cubed (214563) is 9877482786816
  • The square root of 21456 is 146.4786673889
  • The cube root of 21456 is 27.7875071103

Scales and comparisons

How big is 21456?
  • 21,456 seconds is equal to 5 hours, 57 minutes, 36 seconds.
  • To count from 1 to 21,456 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 21456 cubic inches would be around 2.3 feet tall.

Recreational maths with 21456

  • 21456 backwards is 65412
  • 21456 is a Harshad number.
  • The number of decimal digits it has is: 5
  • The sum of 21456's digits is 18
  • More coming soon!

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The information we have on file for 21456 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!

Keywords: Divisors of 21456, math, Factors of 21456, curriculum, school, college, exams, university, Prime factorization of 21456, STEM, science, technology, engineering, physics, economics, calculator, twenty-one thousand, four hundred fifty-six.