21308

21,308 is an even composite number composed of three prime numbers multiplied together.

What does the number 21308 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 12 divisors.

21308 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twelve divisors.

Prime factorization of 21308:

22 × 7 × 761

(2 × 2 × 7 × 761)

See below for interesting mathematical facts about the number 21308 from the Numbermatics database.


Names of 21308

  • Cardinal: 21308 can be written as Twenty-one thousand, three hundred eight.

Scientific notation

  • Scientific notation: 2.1308 × 104

Factors of 21308

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 4
  • Sum of prime factors: 770

Divisors of 21308

  • Number of divisors d(n): 12
  • Complete list of divisors:
  • Sum of all divisors σ(n): 42672
  • Sum of proper divisors (its aliquot sum) s(n): 21364
  • 21308 is an abundant number, because the sum of its proper divisors (21364) is greater than itself. Its abundance is 56

Bases of 21308

  • Binary: 1010011001111002
  • Hexadecimal: 0x533C
  • Base-36: GFW

Squares and roots of 21308

  • 21308 squared (213082) is 454030864
  • 21308 cubed (213083) is 9674489650112
  • The square root of 21308 is 145.9726001687
  • The cube root of 21308 is 27.7234684055

Scales and comparisons

How big is 21308?
  • 21,308 seconds is equal to 5 hours, 55 minutes, 8 seconds.
  • To count from 1 to 21,308 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 21308 cubic inches would be around 2.3 feet tall.

Recreational maths with 21308

  • 21308 backwards is 80312
  • 21308 is a Harshad number.
  • The number of decimal digits it has is: 5
  • The sum of 21308's digits is 14
  • More coming soon!

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The information we have on file for 21308 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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