21,218 is an even composite number composed of two prime numbers multiplied together.

What does the number 21218 look like?

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

21218 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

Prime factorization of 21218:

2 × 1032

(2 × 103 × 103)

See below for interesting mathematical facts about the number 21218 from the Numbermatics database.

Names of 21218

  • Cardinal: 21218 can be written as Twenty-one thousand, two hundred eighteen.

Scientific notation

  • Scientific notation: 2.1218 × 104

Factors of 21218

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 105

Divisors of 21218

  • Number of divisors d(n): 6
  • Complete list of divisors:
  • Sum of all divisors σ(n): 32139
  • Sum of proper divisors (its aliquot sum) s(n): 10921
  • 21218 is a deficient number, because the sum of its proper divisors (10921) is less than itself. Its deficiency is 10297

Bases of 21218

  • Binary: 1010010111000102
  • Hexadecimal: 0x52E2
  • Base-36: GDE

Squares and roots of 21218

  • 21218 squared (212182) is 450203524
  • 21218 cubed (212183) is 9552418372232
  • The square root of 21218 is 145.6639969245
  • The cube root of 21218 is 27.6843808429

Scales and comparisons

How big is 21218?
  • 21,218 seconds is equal to 5 hours, 53 minutes, 38 seconds.
  • To count from 1 to 21,218 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 21218 cubic inches would be around 2.3 feet tall.

Recreational maths with 21218

  • 21218 backwards is 81212
  • The number of decimal digits it has is: 5
  • The sum of 21218's digits is 14
  • More coming soon!

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"Number 21218 - Facts about the integer". Numbermatics.com. 2023. Web. 9 December 2023.

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Numbermatics. (2023). Number 21218 - Facts about the integer. Retrieved 9 December 2023, from https://numbermatics.com/n/21218/

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Numbermatics. 2023. "Number 21218 - Facts about the integer". https://numbermatics.com/n/21218/

The information we have on file for 21218 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 21218, math, Factors of 21218, curriculum, school, college, exams, university, Prime factorization of 21218, STEM, science, technology, engineering, physics, economics, calculator, twenty-one thousand, two hundred eighteen.

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