21645

21,645 is an odd composite number composed of four prime numbers multiplied together.

What does the number 21645 look like?

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

21645 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 21645:

3² × 5 × 13 × 37

(3 × 3 × 5 × 13 × 37)

See below for interesting mathematical facts about the number 21645 from the Numbermatics database.

Names of 21645

Cardinal: 21645 can be written as Twenty-one thousand, six hundred forty-five.

Scientific notation

Scientific notation: 2.1645 × 10⁴

Factors of 21645

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 5
Sum of prime factors: 58

Divisors of 21645

Number of divisors d(n): 24
Complete list of divisors:
1 3 5 9 13 15 37 39 45 65 111 117 185 195 333 481 555 585 1443 1665 2405 4329 7215 21645
Sum of all divisors σ(n): 41496
Sum of proper divisors (its aliquot sum) s(n): 19851
21645 is a deficient number, because the sum of its proper divisors (19851) is less than itself. Its deficiency is 1794

Bases of 21645

Binary: 101010010001101₂
Hexadecimal: 0x548D
Base-36: GP9

Squares and roots of 21645

21645 squared (21645²) is 468506025
21645 cubed (21645³) is 10140812911125
The square root of 21645 is 147.1223980229
The cube root of 21645 is 27.8688595401

Scales and comparisons

How big is 21645?

21,645 seconds is equal to 6 hours, 45 seconds.
To count from 1 to 21,645 would take you about six 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 21645 cubic inches would be around 2.3 feet tall.

Recreational maths with 21645

21645 backwards is 54612
The number of decimal digits it has is: 5
The sum of 21645's digits is 18
More coming soon!

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The information we have on file for 21645 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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