21,390 is an even composite number composed of five prime numbers multiplied together.

What does the number 21390 look like?

This visualization shows the relationship between its 5 prime factors (large circles) and 32 divisors.

21390 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of thirty-two divisors.

Prime factorization of 21390:

2 × 3 × 5 × 23 × 31

See below for interesting mathematical facts about the number 21390 from the Numbermatics database.

Names of 21390

  • Cardinal: 21390 can be written as Twenty-one thousand, three hundred ninety.

Scientific notation

  • Scientific notation: 2.139 × 104

Factors of 21390

  • Number of distinct prime factors ω(n): 5
  • Total number of prime factors Ω(n): 5
  • Sum of prime factors: 64

Divisors of 21390

Bases of 21390

  • Binary: 1010011100011102
  • Hexadecimal: 0x538E
  • Base-36: GI6

Squares and roots of 21390

  • 21390 squared (213902) is 457532100
  • 21390 cubed (213903) is 9786611619000
  • The square root of 21390 is 146.2532050929
  • The cube root of 21390 is 27.7589858085

Scales and comparisons

How big is 21390?
  • 21,390 seconds is equal to 5 hours, 56 minutes, 30 seconds.
  • To count from 1 to 21,390 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 21390 cubic inches would be around 2.3 feet tall.

Recreational maths with 21390

  • 21390 backwards is 09312
  • 21390 is a Harshad number.
  • The number of decimal digits it has is: 5
  • The sum of 21390's digits is 15
  • More coming soon!

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The information we have on file for 21390 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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