21,408 is an even composite number composed of three prime numbers multiplied together.

What does the number 21408 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 24 divisors.

21408 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twenty-four divisors.

Prime factorization of 21408:

25 × 3 × 223

(2 × 2 × 2 × 2 × 2 × 3 × 223)

See below for interesting mathematical facts about the number 21408 from the Numbermatics database.

Names of 21408

  • Cardinal: 21408 can be written as Twenty-one thousand, four hundred eight.

Scientific notation

  • Scientific notation: 2.1408 × 104

Factors of 21408

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 7
  • Sum of prime factors: 228

Divisors of 21408

Bases of 21408

  • Binary: 1010011101000002
  • Hexadecimal: 0x53A0
  • Base-36: GIO

Squares and roots of 21408

  • 21408 squared (214082) is 458302464
  • 21408 cubed (214083) is 9811339149312
  • The square root of 21408 is 146.3147292653
  • The cube root of 21408 is 27.7667701571

Scales and comparisons

How big is 21408?
  • 21,408 seconds is equal to 5 hours, 56 minutes, 48 seconds.
  • To count from 1 to 21,408 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 21408 cubic inches would be around 2.3 feet tall.

Recreational maths with 21408

  • 21408 backwards is 80412
  • The number of decimal digits it has is: 5
  • The sum of 21408's digits is 15
  • More coming soon!

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"Number 21408 - Facts about the integer". Numbermatics.com. 2021. Web. 24 June 2021.

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Numbermatics. (2021). Number 21408 - Facts about the integer. Retrieved 24 June 2021, from https://numbermatics.com/n/21408/

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The information we have on file for 21408 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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