21,689 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21689 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

21689 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

Prime factorization of 21689:

232 × 41

(23 × 23 × 41)

See below for interesting mathematical facts about the number 21689 from the Numbermatics database.

Names of 21689

  • Cardinal: 21689 can be written as Twenty-one thousand, six hundred eighty-nine.

Scientific notation

  • Scientific notation: 2.1689 × 104

Factors of 21689

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 64

Divisors of 21689

  • Number of divisors d(n): 6
  • Complete list of divisors:
  • Sum of all divisors σ(n): 23226
  • Sum of proper divisors (its aliquot sum) s(n): 1537
  • 21689 is a deficient number, because the sum of its proper divisors (1537) is less than itself. Its deficiency is 20152

Bases of 21689

  • Binary: 1010100101110012
  • Hexadecimal: 0x54B9
  • Base-36: GQH

Squares and roots of 21689

  • 21689 squared (216892) is 470412721
  • 21689 cubed (216893) is 10202781505769
  • The square root of 21689 is 147.2718574609
  • The cube root of 21689 is 27.8877307169

Scales and comparisons

How big is 21689?
  • 21,689 seconds is equal to 6 hours, 1 minute, 29 seconds.
  • To count from 1 to 21,689 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 21689 cubic inches would be around 2.3 feet tall.

Recreational maths with 21689

  • 21689 backwards is 98612
  • The number of decimal digits it has is: 5
  • The sum of 21689's digits is 26
  • More coming soon!

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The information we have on file for 21689 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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