21555

21,555 is an odd composite number composed of three prime numbers multiplied together.

What does the number 21555 look like?

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

21555 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 21555:

3² × 5 × 479

(3 × 3 × 5 × 479)

See below for interesting mathematical facts about the number 21555 from the Numbermatics database.

Names of 21555

Cardinal: 21555 can be written as Twenty-one thousand, five hundred fifty-five.

Scientific notation

Scientific notation: 2.1555 × 10⁴

Factors of 21555

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 4
Sum of prime factors: 487

Divisors of 21555

Number of divisors d(n): 12
Complete list of divisors:
1 3 5 9 15 45 479 1437 2395 4311 7185 21555
Sum of all divisors σ(n): 37440
Sum of proper divisors (its aliquot sum) s(n): 15885
21555 is a deficient number, because the sum of its proper divisors (15885) is less than itself. Its deficiency is 5670

Bases of 21555

Binary: 101010000110011₂
Hexadecimal: 0x5433
Base-36: GMR

Squares and roots of 21555

21555 squared (21555²) is 464618025
21555 cubed (21555³) is 10014841528875
The square root of 21555 is 146.8162116389
The cube root of 21555 is 27.8301796023

Scales and comparisons

How big is 21555?

21,555 seconds is equal to 5 hours, 59 minutes, 15 seconds.
To count from 1 to 21,555 would take you about five 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 21555 cubic inches would be around 2.3 feet tall.

Recreational maths with 21555

21555 backwards is 55512
The number of decimal digits it has is: 5
The sum of 21555's digits is 18
More coming soon!

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The information we have on file for 21555 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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