21840

21,840 is an even composite number composed of five prime numbers multiplied together.

What does the number 21840 look like?

This visualization shows the relationship between its 5 prime factors (large circles) and 80 divisors.

21840 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of eighty divisors.

Prime factorization of 21840:

24 × 3 × 5 × 7 × 13

(2 × 2 × 2 × 2 × 3 × 5 × 7 × 13)

See below for interesting mathematical facts about the number 21840 from the Numbermatics database.


Names of 21840

  • Cardinal: 21840 can be written as Twenty-one thousand, eight hundred forty.

Scientific notation

  • Scientific notation: 2.184 × 104

Factors of 21840

  • Number of distinct prime factors ω(n): 5
  • Total number of prime factors Ω(n): 8
  • Sum of prime factors: 30

Divisors of 21840

Bases of 21840

  • Binary: 1010101010100002
  • Hexadecimal: 0x5550
  • Base-36: GUO

Squares and roots of 21840

  • 21840 squared (218402) is 476985600
  • 21840 cubed (218403) is 10417365504000
  • The square root of 21840 is 147.7836256153
  • The cube root of 21840 is 27.9522997373

Scales and comparisons

How big is 21840?
  • 21,840 seconds is equal to 6 hours, 4 minutes.
  • To count from 1 to 21,840 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 21840 cubic inches would be around 2.3 feet tall.

Recreational maths with 21840

  • 21840 backwards is 04812
  • 21840 is a Harshad number.
  • The number of decimal digits it has is: 5
  • The sum of 21840's digits is 15
  • More coming soon!

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"Number 21840 - Facts about the integer". Numbermatics.com. 2024. Web. 25 April 2024.

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Numbermatics. (2024). Number 21840 - Facts about the integer. Retrieved 25 April 2024, from https://numbermatics.com/n/21840/

Chicago style:
Numbermatics. 2024. "Number 21840 - Facts about the integer". https://numbermatics.com/n/21840/

The information we have on file for 21840 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 21840, math, Factors of 21840, curriculum, school, college, exams, university, Prime factorization of 21840, STEM, science, technology, engineering, physics, economics, calculator, twenty-one thousand, eight hundred forty.

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