21381720
21,381,720 is an even composite number composed of six prime numbers multiplied together.
21381720 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of one hundred twenty-eight divisors.
Prime factorization of 21381720:
23 × 3 × 5 × 23 × 61 × 127
(2 × 2 × 2 × 3 × 5 × 23 × 61 × 127)See below for interesting mathematical facts about the number 21381720 from the Numbermatics database.
Names of 21381720
- Cardinal: 21381720 can be written as Twenty-one million, three hundred eighty-one thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 2.138172 × 107
Factors of 21381720
Divisors of 21381720
- Number of divisors d(n): 128
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Complete list of divisors:
1 2 3 4 5 6 8 10 12 15 20 23 24 30 40 46 60 61 69 92 115 120 122 127 138 183 184 230 244 254 276 305 345 366 381 460 488 508 552 610 635 690 732 762 915 920 1016 1220 1270 1380 1403 1464 1524 1830 1905 2440 2540 2760 2806 2921 3048 3660 3810 4209 5080 5612 5842 7015 7320 7620 7747 8418 8763 11224 11684 14030 14605 15240 15494 16836 17526 21045 23241 23368 28060 29210 30988 33672 35052 38735 42090 43815 46482 56120 58420 61976 70104 77470 84180 87630 92964 116205 116840 154940 168360 175260 178181 185928 232410 309880 350520 356362 464820 534543 712724 890905 929640 1069086 1425448 1781810 2138172 2672715 3563620 4276344 5345430 7127240 10690860 21381720
- Sum of all divisors σ(n): 68567040
- Sum of proper divisors (its aliquot sum) s(n): 47185320
- 21381720 is an abundant number, because the sum of its proper divisors (47185320) is greater than itself. Its abundance is 25803600
Bases of 21381720
- Binary: 10100011001000010010110002
- Hexadecimal: 0x1464258
- Base-36: CQA8O
Squares and roots of 21381720
- 21381720 squared (213817202) is 457177950158400
- 21381720 cubed (213817203) is 9775250920460864448000
-
The
square root of 21381720 is 4624.0371970823 -
The
cube root of 21381720 is 277.5540354153
Scales and comparisons
How big is 21381720?- 21,381,720 seconds is equal to 35 weeks, 2 days, 11 hours, 22 minutes.
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To count from 1 to 21,381,720 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 21381720 cubic inches would be around 23.1 feet tall.
Recreational maths with 21381720
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"Number 21381720 - Facts about the integer". Numbermatics.com. 2024. Web. 10 May 2024.
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The information we have on file for 21381720 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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