21428

21,428 is an even composite number composed of three prime numbers multiplied together.

What does the number 21428 look like?

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

21428 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 21428:

22 × 11 × 487

(2 × 2 × 11 × 487)

See below for interesting mathematical facts about the number 21428 from the Numbermatics database.


Names of 21428

  • Cardinal: 21428 can be written as Twenty-one thousand, four hundred twenty-eight.

Scientific notation

  • Scientific notation: 2.1428 × 104

Factors of 21428

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 4
  • Sum of prime factors: 500

Divisors of 21428

  • Number of divisors d(n): 12
  • Complete list of divisors:
  • Sum of all divisors σ(n): 40992
  • Sum of proper divisors (its aliquot sum) s(n): 19564
  • 21428 is a deficient number, because the sum of its proper divisors (19564) is less than itself. Its deficiency is 1864

Bases of 21428

  • Binary: 1010011101101002
  • Hexadecimal: 0x53B4
  • Base-36: GJ8

Squares and roots of 21428

  • 21428 squared (214282) is 459159184
  • 21428 cubed (214283) is 9838862994752
  • The square root of 21428 is 146.3830591291
  • The cube root of 21428 is 27.7754143175

Scales and comparisons

How big is 21428?
  • 21,428 seconds is equal to 5 hours, 57 minutes, 8 seconds.
  • To count from 1 to 21,428 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 21428 cubic inches would be around 2.3 feet tall.

Recreational maths with 21428

  • 21428 backwards is 82412
  • The number of decimal digits it has is: 5
  • The sum of 21428's digits is 17
  • More coming soon!

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"Number 21428 - Facts about the integer". Numbermatics.com. 2024. Web. 28 March 2024.

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Numbermatics. (2024). Number 21428 - Facts about the integer. Retrieved 28 March 2024, from https://numbermatics.com/n/21428/

Chicago style:
Numbermatics. 2024. "Number 21428 - Facts about the integer". https://numbermatics.com/n/21428/

The information we have on file for 21428 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 21428, math, Factors of 21428, curriculum, school, college, exams, university, Prime factorization of 21428, STEM, science, technology, engineering, physics, economics, calculator, twenty-one thousand, four hundred twenty-eight.

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