121 is an odd composite number. It is composed of a single prime number multiplied by itself.

What does the number 121 look like?

This visualization shows the relationship between its 1 prime factors (large circles) and 3 divisors.

121 is an odd composite number. It has a total of three divisors.

Prime factorization of 121:


(11 × 11)

See below for interesting mathematical facts about the number 121 from the Numbermatics database.

Names of 121

  • Cardinal: 121 can be written as One hundred twenty-one.

Scientific notation

  • Scientific notation: 1.21 × 102

Factors of 121

  • Number of distinct prime factors ω(n): 1
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 11

Divisors of 121

  • Number of divisors d(n): 3
  • Complete list of divisors:
    1 11 121
  • Sum of all divisors σ(n): 133
  • Sum of proper divisors (its aliquot sum) s(n): 12
  • 121 is a deficient number, because the sum of its proper divisors (12) is less than itself. Its deficiency is 109

Bases of 121

  • Binary: 11110012
  • Hexadecimal: 0x79
  • Base-36: 3D

Squares and roots of 121

  • 121 squared (1212) is 14641
  • 121 cubed (1213) is 1771561
  • 121 is a perfect square number. Its square root is 11
  • The cube root of 121 is 4.9460874433

Scales and comparisons

How big is 121?
  • 121 seconds is equal to 2 minutes, 1 second.
  • To count from 1 to 121 would take you about .

    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 121 cubic inches would be around 0.4 feet tall.

Recreational maths with 121

  • 121 is the same when its digits are reversed! That makes it a palindromic number.
  • The number of decimal digits it has is: 3
  • The sum of 121's digits is 4
  • More coming soon!

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"Number 121 - Facts about the integer". Numbermatics.com. 2024. Web. 23 June 2024.

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Numbermatics. (2024). Number 121 - Facts about the integer. Retrieved 23 June 2024, from https://numbermatics.com/n/121/

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Numbermatics. 2024. "Number 121 - Facts about the integer". https://numbermatics.com/n/121/

The information we have on file for 121 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 121, math, Factors of 121, curriculum, school, college, exams, university, Prime factorization of 121, STEM, science, technology, engineering, physics, economics, calculator, one hundred twenty-one.

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