21256720

21,256,720 is an even composite number composed of three prime numbers multiplied together.

What does the number 21256720 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 20 divisors.

21256720 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twenty divisors.

Prime factorization of 21256720:

2⁴ × 5 × 265709

(2 × 2 × 2 × 2 × 5 × 265709)

See below for interesting mathematical facts about the number 21256720 from the Numbermatics database.

Names of 21256720

Cardinal: 21256720 can be written as Twenty-one million, two hundred fifty-six thousand, seven hundred twenty.

Scientific notation

Scientific notation: 2.125672 × 10⁷

Factors of 21256720

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 6
Sum of prime factors: 265716

Divisors of 21256720

Number of divisors d(n): 20
Complete list of divisors:
1 2 4 5 8 10 16 20 40 80 265709 531418 1062836 1328545 2125672 2657090 4251344 5314180 10628360 21256720
Sum of all divisors σ(n): 49422060
Sum of proper divisors (its aliquot sum) s(n): 28165340
21256720 is an abundant number, because the sum of its proper divisors (28165340) is greater than itself. Its abundance is 6908620

Bases of 21256720

Binary: 1010001000101101000010000₂
Hexadecimal: 0x1445A10
Base-36: CNLSG

Squares and roots of 21256720

21256720 squared (21256720²) is 451848145158400
21256720 cubed (21256720³) is 9604809504151464448000
The square root of 21256720 is 4610.5010573689
The cube root of 21256720 is 277.0121070181

Scales and comparisons

How big is 21256720?

21,256,720 seconds is equal to 35 weeks, 1 day, 38 minutes, 40 seconds.
To count from 1 to 21,256,720 would take you about five 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 21256720 cubic inches would be around 23.1 feet tall.

Recreational maths with 21256720

21256720 backwards is 02765212
The number of decimal digits it has is: 8
The sum of 21256720's digits is 25
More coming soon!

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The information we have on file for 21256720 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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