21681990
21,681,990 is an even composite number composed of five prime numbers multiplied together.
What does the number 21681990 look like?
This visualization shows the relationship between its 5 prime factors (large circles) and 96 divisors.
21681990 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of ninety-six divisors.
Prime factorization of 21681990:
2 × 32 × 5 × 113 × 181
(2 × 3 × 3 × 5 × 11 × 11 × 11 × 181)See below for interesting mathematical facts about the number 21681990 from the Numbermatics database.
Names of 21681990
- Cardinal: 21681990 can be written as Twenty-one million, six hundred eighty-one thousand, nine hundred ninety.
Scientific notation
- Scientific notation: 2.168199 × 107
Factors of 21681990
Divisors of 21681990
- Number of divisors d(n): 96
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Complete list of divisors:
1 2 3 5 6 9 10 11 15 18 22 30 33 45 55 66 90 99 110 121 165 181 198 242 330 362 363 495 543 605 726 905 990 1086 1089 1210 1331 1629 1810 1815 1991 2178 2662 2715 3258 3630 3982 3993 5430 5445 5973 6655 7986 8145 9955 10890 11946 11979 13310 16290 17919 19910 19965 21901 23958 29865 35838 39930 43802 59730 59895 65703 89595 109505 119790 131406 179190 197109 219010 240911 328515 394218 481822 657030 722733 985545 1204555 1445466 1971090 2168199 2409110 3613665 4336398 7227330 10840995 21681990
- Sum of all divisors σ(n): 62348832
- Sum of proper divisors (its aliquot sum) s(n): 40666842
- 21681990 is an abundant number, because the sum of its proper divisors (40666842) is greater than itself. Its abundance is 18984852
Bases of 21681990
- Binary: 10100101011010111010001102
- Hexadecimal: 0x14AD746
- Base-36: CWPXI
Squares and roots of 21681990
- 21681990 squared (216819902) is 470108690360100
- 21681990 cubed (216819903) is 10192891923300784599000
-
The
square root of 21681990 is 4656.3923803735 -
The
cube root of 21681990 is 278.8472590559
Scales and comparisons
How big is 21681990?- 21,681,990 seconds is equal to 35 weeks, 5 days, 22 hours, 46 minutes, 30 seconds.
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To count from 1 to 21,681,990 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 21681990 cubic inches would be around 23.2 feet tall.
Recreational maths with 21681990
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"Number 21681990 - Facts about the integer". Numbermatics.com. 2024. Web. 2 May 2024.
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The information we have on file for 21681990 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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