21021

21,021 is an odd composite number composed of four prime numbers multiplied together.

What does the number 21021 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 24 divisors.

21021 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of twenty-four divisors.

Prime factorization of 21021:

3 × 7² × 11 × 13

(3 × 7 × 7 × 11 × 13)

See below for interesting mathematical facts about the number 21021 from the Numbermatics database.

Names of 21021

Cardinal: 21021 can be written as Twenty-one thousand and twenty-one.

Scientific notation

Scientific notation: 2.1021 × 10⁴

Factors of 21021

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 5
Sum of prime factors: 34

Divisors of 21021

Number of divisors d(n): 24
Complete list of divisors:
1 3 7 11 13 21 33 39 49 77 91 143 147 231 273 429 539 637 1001 1617 1911 3003 7007 21021
Sum of all divisors σ(n): 38304
Sum of proper divisors (its aliquot sum) s(n): 17283
21021 is a deficient number, because the sum of its proper divisors (17283) is less than itself. Its deficiency is 3738

Bases of 21021

Binary: 101001000011101₂
Hexadecimal: 0x521D
Base-36: G7X

Squares and roots of 21021

21021 squared (21021²) is 441882441
21021 cubed (21021³) is 9288810792261
The square root of 21021 is 144.9862062405
The cube root of 21021 is 27.5984351139

Scales and comparisons

How big is 21021?

21,021 seconds is equal to 5 hours, 50 minutes, 21 seconds.
To count from 1 to 21,021 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 21021 cubic inches would be around 2.3 feet tall.

Recreational maths with 21021

21021 backwards is 12012
The number of decimal digits it has is: 5
The sum of 21021's digits is 6
More coming soon!

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The information we have on file for 21021 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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