21018642720
21,018,642,720 is an even composite number composed of four prime numbers multiplied together.
21018642720 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of forty-eight divisors.
Prime factorization of 21018642720:
25 × 3 × 5 × 43788839
(2 × 2 × 2 × 2 × 2 × 3 × 5 × 43788839)See below for interesting mathematical facts about the number 21018642720 from the Numbermatics database.
Names of 21018642720
- Cardinal: 21018642720 can be written as Twenty-one billion, eighteen million, six hundred forty-two thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 2.101864272 × 1010
Factors of 21018642720
Divisors of 21018642720
- Number of divisors d(n): 48
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Complete list of divisors:
1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 60 80 96 120 160 240 480 43788839 87577678 131366517 175155356 218944195 262733034 350310712 437888390 525466068 656832585 700621424 875776780 1050932136 1313665170 1401242848 1751553560 2101864272 2627330340 3503107120 4203728544 5254660680 7006214240 10509321360 21018642720
- Sum of all divisors σ(n): 66208726080
- Sum of proper divisors (its aliquot sum) s(n): 45190083360
- 21018642720 is an abundant number, because the sum of its proper divisors (45190083360) is greater than itself. Its abundance is 24171440640
Bases of 21018642720
- Binary: 100111001001100111100001001001000002
- Hexadecimal: 0x4E4CF0920
- Base-36: 9NLYGIO
Squares and roots of 21018642720
- 21018642720 squared (210186427202) is 441783341791008998400
- 21018642720 cubed (210186427203) is 9285686220752863045674651648000
-
The
square root of 21018642720 is 144978.0766874771 -
The
cube root of 21018642720 is 2759.7403452433
Scales and comparisons
How big is 21018642720?- 21,018,642,720 seconds is equal to 668 years, 17 weeks, 7 hours, 52 minutes.
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To count from 1 to 21,018,642,720 would take you about one thousand, three hundred thirty-six 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 21018642720 cubic inches would be around 230 feet tall.
Recreational maths with 21018642720
- 21018642720 backwards is 02724681012
- The number of decimal digits it has is: 11
- The sum of 21018642720's digits is 33
- More coming soon!
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