21105721

21,105,721 is an odd composite number composed of four prime numbers multiplied together.

What does the number 21105721 look like?

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

21105721 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 21105721:

7² × 13 × 17 × 1949

(7 × 7 × 13 × 17 × 1949)

See below for interesting mathematical facts about the number 21105721 from the Numbermatics database.

Names of 21105721

Cardinal: 21105721 can be written as Twenty-one million, one hundred five thousand, seven hundred twenty-one.

Scientific notation

Scientific notation: 2.1105721 × 10⁷

Factors of 21105721

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 5
Sum of prime factors: 1986

Divisors of 21105721

Number of divisors d(n): 24
Complete list of divisors:
1 7 13 17 49 91 119 221 637 833 1547 1949 10829 13643 25337 33133 95501 177359 231931 430729 1241513 1623517 3015103 21105721
Sum of all divisors σ(n): 28009800
Sum of proper divisors (its aliquot sum) s(n): 6904079
21105721 is a deficient number, because the sum of its proper divisors (6904079) is less than itself. Its deficiency is 14201642

Bases of 21105721

Binary: 1010000100000110000111001₂
Hexadecimal: 0x1420C39
Base-36: CKDA1

Squares and roots of 21105721

21105721 squared (21105721²) is 445451458929841
21105721 cubed (21105721³) is 9401574211216182720361
The square root of 21105721 is 4594.0963202789
The cube root of 21105721 is 276.3546210065

Scales and comparisons

How big is 21105721?

21,105,721 seconds is equal to 34 weeks, 6 days, 6 hours, 42 minutes, 1 second.
To count from 1 to 21,105,721 would take you about two days!

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 21105721 cubic inches would be around 23 feet tall.

Recreational maths with 21105721

21105721 backwards is 12750112
The number of decimal digits it has is: 8
The sum of 21105721's digits is 19
More coming soon!

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The information we have on file for 21105721 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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