21081872721
21,081,872,721 is an odd composite number composed of five prime numbers multiplied together.
21081872721 is an odd composite number. It is composed of five distinct prime numbers multiplied together. It has a total of forty-eight divisors.
Prime factorization of 21081872721:
3 × 7 × 132 × 73 × 81373
(3 × 7 × 13 × 13 × 73 × 81373)See below for interesting mathematical facts about the number 21081872721 from the Numbermatics database.
Names of 21081872721
- Cardinal: 21081872721 can be written as Twenty-one billion, eighty-one million, eight hundred seventy-two thousand, seven hundred twenty-one.
Scientific notation
- Scientific notation: 2.1081872721 × 1010
Factors of 21081872721
Divisors of 21081872721
- Number of divisors d(n): 48
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Complete list of divisors:
1 3 7 13 21 39 73 91 169 219 273 507 511 949 1183 1533 2847 3549 6643 12337 19929 37011 81373 86359 244119 259077 569611 1057849 1708833 3173547 5940229 7404943 13752037 17820687 22214829 41256111 41581603 77222977 96264259 124744809 231668931 288792777 540560839 1003898701 1621682517 3011696103 7027290907 21081872721
- Sum of all divisors σ(n): 35262934656
- Sum of proper divisors (its aliquot sum) s(n): 14181061935
- 21081872721 is a deficient number, because the sum of its proper divisors (14181061935) is less than itself. Its deficiency is 6900810786
Bases of 21081872721
- Binary: 100111010001001001111011001010100012
- Hexadecimal: 0x4E893D951
- Base-36: 9ONLP3L
Squares and roots of 21081872721
- 21081872721 squared (210818727212) is 444445357424443943841
- 21081872721 cubed (210818727213) is 9369740456661479598255233861361
-
The
square root of 21081872721 is 145195.9803885769 -
The
cube root of 21081872721 is 2762.5049337859
Scales and comparisons
How big is 21081872721?- 21,081,872,721 seconds is equal to 670 years, 17 weeks, 4 days, 3 hours, 45 minutes, 21 seconds.
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To count from 1 to 21,081,872,721 would take you about one thousand, three hundred forty years!
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 21081872721 cubic inches would be around 230.2 feet tall.
Recreational maths with 21081872721
- 21081872721 backwards is 12727818012
- 21081872721 is a
Harshad number . - The number of decimal digits it has is: 11
- The sum of 21081872721's digits is 39
- More coming soon!
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The information we have on file for 21081872721 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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