21981008
21,981,008 is an even composite number composed of four prime numbers multiplied together.
21981008 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of ninety divisors.
Prime factorization of 21981008:
24 × 72 × 232 × 53
(2 × 2 × 2 × 2 × 7 × 7 × 23 × 23 × 53)See below for interesting mathematical facts about the number 21981008 from the Numbermatics database.
Names of 21981008
- Cardinal: 21981008 can be written as Twenty-one million, nine hundred eighty-one thousand and eight.
Scientific notation
- Scientific notation: 2.1981008 × 107
Factors of 21981008
Divisors of 21981008
- Number of divisors d(n): 90
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Complete list of divisors:
1 2 4 7 8 14 16 23 28 46 49 53 56 92 98 106 112 161 184 196 212 322 368 371 392 424 529 644 742 784 848 1058 1127 1219 1288 1484 2116 2254 2438 2576 2597 2968 3703 4232 4508 4876 5194 5936 7406 8464 8533 9016 9752 10388 14812 17066 18032 19504 20776 25921 28037 29624 34132 41552 51842 56074 59248 59731 68264 103684 112148 119462 136528 196259 207368 224296 238924 392518 414736 448592 477848 785036 955696 1373813 1570072 2747626 3140144 5495252 10990504 21981008
- Sum of all divisors σ(n): 52766154
- Sum of proper divisors (its aliquot sum) s(n): 30785146
- 21981008 is an abundant number, because the sum of its proper divisors (30785146) is greater than itself. Its abundance is 8804138
Bases of 21981008
- Binary: 10100111101100111010100002
- Hexadecimal: 0x14F6750
- Base-36: D34NK
Squares and roots of 21981008
- 21981008 squared (219810082) is 483164712696064
- 21981008 cubed (219810083) is 10620447415089884352512
-
The
square root of 21981008 is 4688.3907686967 -
The
cube root of 21981008 is 280.1232790477
Scales and comparisons
How big is 21981008?- 21,981,008 seconds is equal to 36 weeks, 2 days, 9 hours, 50 minutes, 8 seconds.
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To count from 1 to 21,981,008 would take you about two weeks!
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 21981008 cubic inches would be around 23.3 feet tall.
Recreational maths with 21981008
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