21381540

21,381,540 is an even composite number composed of five prime numbers multiplied together.

What does the number 21381540 look like?

This visualization shows the relationship between its 5 prime factors (large circles) and 48 divisors.

21381540 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of forty-eight divisors.

Prime factorization of 21381540:

2² × 3 × 5 × 433 × 823

(2 × 2 × 3 × 5 × 433 × 823)

See below for interesting mathematical facts about the number 21381540 from the Numbermatics database.

Names of 21381540

Cardinal: 21381540 can be written as Twenty-one million, three hundred eighty-one thousand, five hundred forty.

Scientific notation

Scientific notation: 2.138154 × 10⁷

Factors of 21381540

Number of distinct prime factors ω(n): 5
Total number of prime factors Ω(n): 6
Sum of prime factors: 1266

Divisors of 21381540

Number of divisors d(n): 48
Complete list of divisors:
1 2 3 4 5 6 10 12 15 20 30 60 433 823 866 1299 1646 1732 2165 2469 2598 3292 4115 4330 4938 5196 6495 8230 8660 9876 12345 12990 16460 24690 25980 49380 356359 712718 1069077 1425436 1781795 2138154 3563590 4276308 5345385 7127180 10690770 21381540
Sum of all divisors σ(n): 60079488
Sum of proper divisors (its aliquot sum) s(n): 38697948
21381540 is an abundant number, because the sum of its proper divisors (38697948) is greater than itself. Its abundance is 17316408

Bases of 21381540

Binary: 1010001100100000110100100₂
Hexadecimal: 0x14641A4
Base-36: CQA3O

Squares and roots of 21381540

21381540 squared (21381540²) is 457170252771600
21381540 cubed (21381540³) is 9775004046446076264000
The square root of 21381540 is 4624.0177335301
The cube root of 21381540 is 277.5532565589

Scales and comparisons

How big is 21381540?

21,381,540 seconds is equal to 35 weeks, 2 days, 11 hours, 19 minutes.
To count from 1 to 21,381,540 would take you about four 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 21381540 cubic inches would be around 23.1 feet tall.

Recreational maths with 21381540

21381540 backwards is 04518312
The number of decimal digits it has is: 8
The sum of 21381540's digits is 24
More coming soon!

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The information we have on file for 21381540 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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