21,819 is an odd composite number composed of three prime numbers multiplied together.

What does the number 21819 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

21819 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 21819:

3 × 7 × 1039

See below for interesting mathematical facts about the number 21819 from the Numbermatics database.

Names of 21819

  • Cardinal: 21819 can be written as Twenty-one thousand, eight hundred nineteen.

Scientific notation

  • Scientific notation: 2.1819 × 104

Factors of 21819

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 1049

Divisors of 21819

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 33280
  • Sum of proper divisors (its aliquot sum) s(n): 11461
  • 21819 is a deficient number, because the sum of its proper divisors (11461) is less than itself. Its deficiency is 10358

Bases of 21819

  • Binary: 1010101001110112
  • Hexadecimal: 0x553B
  • Base-36: GU3

Squares and roots of 21819

  • 21819 squared (218192) is 476068761
  • 21819 cubed (218193) is 10387344296259
  • The square root of 21819 is 147.7125587077
  • The cube root of 21819 is 27.9433377939

Scales and comparisons

How big is 21819?
  • 21,819 seconds is equal to 6 hours, 3 minutes, 39 seconds.
  • To count from 1 to 21,819 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 21819 cubic inches would be around 2.3 feet tall.

Recreational maths with 21819

  • 21819 backwards is 91812
  • 21819 is a Harshad number.
  • The number of decimal digits it has is: 5
  • The sum of 21819's digits is 21
  • More coming soon!

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The information we have on file for 21819 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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