21687138
21,687,138 is an even composite number composed of five prime numbers multiplied together.
21687138 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of seventy-two divisors.
Prime factorization of 21687138:
2 × 32 × 11 × 172 × 379
(2 × 3 × 3 × 11 × 17 × 17 × 379)See below for interesting mathematical facts about the number 21687138 from the Numbermatics database.
Names of 21687138
- Cardinal: 21687138 can be written as Twenty-one million, six hundred eighty-seven thousand, one hundred thirty-eight.
Scientific notation
- Scientific notation: 2.1687138 × 107
Factors of 21687138
Divisors of 21687138
- Number of divisors d(n): 72
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Complete list of divisors:
1 2 3 6 9 11 17 18 22 33 34 51 66 99 102 153 187 198 289 306 374 379 561 578 758 867 1122 1137 1683 1734 2274 2601 3179 3366 3411 4169 5202 6358 6443 6822 8338 9537 12507 12886 19074 19329 25014 28611 37521 38658 57222 57987 70873 75042 109531 115974 141746 212619 219062 328593 425238 637857 657186 985779 1204841 1275714 1971558 2409682 3614523 7229046 10843569 21687138
- Sum of all divisors σ(n): 54596880
- Sum of proper divisors (its aliquot sum) s(n): 32909742
- 21687138 is an abundant number, because the sum of its proper divisors (32909742) is greater than itself. Its abundance is 11222604
Bases of 21687138
- Binary: 10100101011101011011000102
- Hexadecimal: 0x14AEB62
- Base-36: CWTWI
Squares and roots of 21687138
- 21687138 squared (216871382) is 470331954631044
- 21687138 cubed (216871383) is 10200154005893190312072
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The
square root of 21687138 is 4656.9451360307 -
The
cube root of 21687138 is 278.8693264045
Scales and comparisons
How big is 21687138?- 21,687,138 seconds is equal to 35 weeks, 6 days, 12 minutes, 18 seconds.
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To count from 1 to 21,687,138 would take you about five days!
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 21687138 cubic inches would be around 23.2 feet tall.
Recreational maths with 21687138
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The information we have on file for 21687138 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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