21900

21,900 is an even composite number composed of four prime numbers multiplied together.

What does the number 21900 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 36 divisors.

21900 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of thirty-six divisors.

Prime factorization of 21900:

2² × 3 × 5² × 73

(2 × 2 × 3 × 5 × 5 × 73)

See below for interesting mathematical facts about the number 21900 from the Numbermatics database.

Names of 21900

Cardinal: 21900 can be written as Twenty-one thousand, nine hundred.

Scientific notation

Scientific notation: 2.19 × 10⁴

Factors of 21900

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 6
Sum of prime factors: 83

Divisors of 21900

Number of divisors d(n): 36
Complete list of divisors:
1 2 3 4 5 6 10 12 15 20 25 30 50 60 73 75 100 146 150 219 292 300 365 438 730 876 1095 1460 1825 2190 3650 4380 5475 7300 10950 21900
Sum of all divisors σ(n): 64232
Sum of proper divisors (its aliquot sum) s(n): 42332
21900 is an abundant number, because the sum of its proper divisors (42332) is greater than itself. Its abundance is 20432

Bases of 21900

Binary: 101010110001100₂
Hexadecimal: 0x558C
Base-36: GWC

Squares and roots of 21900

21900 squared (21900²) is 479610000
21900 cubed (21900³) is 10503459000000
The square root of 21900 is 147.9864858695
The cube root of 21900 is 27.9778736763

Scales and comparisons

How big is 21900?

21,900 seconds is equal to 6 hours, 5 minutes.
To count from 1 to 21,900 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 21900 cubic inches would be around 2.3 feet tall.

Recreational maths with 21900

21900 backwards is 00912
21900 is a Harshad number.
The number of decimal digits it has is: 5
The sum of 21900's digits is 12
More coming soon!

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The information we have on file for 21900 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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