21987021

21,987,021 is an odd composite number composed of four prime numbers multiplied together.

What does the number 21987021 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 16 divisors.

21987021 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixteen divisors.

Prime factorization of 21987021:

3 × 7 × 811 × 1291

See below for interesting mathematical facts about the number 21987021 from the Numbermatics database.

Names of 21987021

Cardinal: 21987021 can be written as Twenty-one million, nine hundred eighty-seven thousand and twenty-one.

Scientific notation

Scientific notation: 2.1987021 × 10⁷

Factors of 21987021

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 4
Sum of prime factors: 2112

Divisors of 21987021

Number of divisors d(n): 16
Complete list of divisors:
1 3 7 21 811 1291 2433 3873 5677 9037 17031 27111 1047001 3141003 7329007 21987021
Sum of all divisors σ(n): 33571328
Sum of proper divisors (its aliquot sum) s(n): 11584307
21987021 is a deficient number, because the sum of its proper divisors (11584307) is less than itself. Its deficiency is 10402714

Bases of 21987021

Binary: 1010011110111111011001101₂
Hexadecimal: 0x14F7ECD
Base-36: D39AL

Squares and roots of 21987021

21987021 squared (21987021²) is 483429092454441
21987021 cubed (21987021³) is 10629165607806735810261
The square root of 21987021 is 4689.0319896541
The cube root of 21987021 is 280.1488196981

Scales and comparisons

How big is 21987021?

21,987,021 seconds is equal to 36 weeks, 2 days, 11 hours, 30 minutes, 21 seconds.
To count from 1 to 21,987,021 would take you about two weeks!

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 21987021 cubic inches would be around 23.3 feet tall.

Recreational maths with 21987021

21987021 backwards is 12078912
The number of decimal digits it has is: 8
The sum of 21987021's digits is 30
More coming soon!

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The information we have on file for 21987021 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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