21309813

21,309,813 is an odd composite number composed of three prime numbers multiplied together.

What does the number 21309813 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 12 divisors.

21309813 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twelve divisors.

Prime factorization of 21309813:

3² × 7 × 338251

(3 × 3 × 7 × 338251)

See below for interesting mathematical facts about the number 21309813 from the Numbermatics database.

Names of 21309813

Cardinal: 21309813 can be written as Twenty-one million, three hundred nine thousand, eight hundred thirteen.

Scientific notation

Scientific notation: 2.1309813 × 10⁷

Factors of 21309813

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 4
Sum of prime factors: 338261

Divisors of 21309813

Number of divisors d(n): 12
Complete list of divisors:
1 3 7 9 21 63 338251 1014753 2367757 3044259 7103271 21309813
Sum of all divisors σ(n): 35178208
Sum of proper divisors (its aliquot sum) s(n): 13868395
21309813 is a deficient number, because the sum of its proper divisors (13868395) is less than itself. Its deficiency is 7441418

Bases of 21309813

Binary: 1010001010010100101110101₂
Hexadecimal: 0x1452975
Base-36: COQR9

Squares and roots of 21309813

21309813 squared (21309813²) is 454108130094969
21309813 cubed (21309813³) is 9676959334103461630797
The square root of 21309813 is 4616.2553005657
The cube root of 21309813 is 277.2425467069

Scales and comparisons

How big is 21309813?

21,309,813 seconds is equal to 35 weeks, 1 day, 15 hours, 23 minutes, 33 seconds.
To count from 1 to 21,309,813 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 21309813 cubic inches would be around 23.1 feet tall.

Recreational maths with 21309813

21309813 backwards is 31890312
The number of decimal digits it has is: 8
The sum of 21309813's digits is 27
More coming soon!

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The information we have on file for 21309813 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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