21540

21,540 is an even composite number composed of four prime numbers multiplied together.

What does the number 21540 look like?

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

21540 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of twenty-four divisors.

Prime factorization of 21540:

2² × 3 × 5 × 359

(2 × 2 × 3 × 5 × 359)

See below for interesting mathematical facts about the number 21540 from the Numbermatics database.

Names of 21540

Cardinal: 21540 can be written as Twenty-one thousand, five hundred forty.

Scientific notation

Scientific notation: 2.154 × 10⁴

Factors of 21540

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 5
Sum of prime factors: 369

Divisors of 21540

Number of divisors d(n): 24
Complete list of divisors:
1 2 3 4 5 6 10 12 15 20 30 60 359 718 1077 1436 1795 2154 3590 4308 5385 7180 10770 21540
Sum of all divisors σ(n): 60480
Sum of proper divisors (its aliquot sum) s(n): 38940
21540 is an abundant number, because the sum of its proper divisors (38940) is greater than itself. Its abundance is 17400

Bases of 21540

Binary: 101010000100100₂
Hexadecimal: 0x5424
Base-36: GMC

Squares and roots of 21540

21540 squared (21540²) is 463971600
21540 cubed (21540³) is 9993948264000
The square root of 21540 is 146.7651184717
The cube root of 21540 is 27.8237224837

Scales and comparisons

How big is 21540?

21,540 seconds is equal to 5 hours, 59 minutes.
To count from 1 to 21,540 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 21540 cubic inches would be around 2.3 feet tall.

Recreational maths with 21540

21540 backwards is 04512
21540 is a Harshad number.
The number of decimal digits it has is: 5
The sum of 21540's digits is 12
More coming soon!

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The information we have on file for 21540 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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