21991008
21,991,008 is an even composite number composed of five prime numbers multiplied together.
21991008 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 21991008:
25 × 3 × 13 × 67 × 263
(2 × 2 × 2 × 2 × 2 × 3 × 13 × 67 × 263)See below for interesting mathematical facts about the number 21991008 from the Numbermatics database.
Names of 21991008
- Cardinal: 21991008 can be written as Twenty-one million, nine hundred ninety-one thousand and eight.
Scientific notation
- Scientific notation: 2.1991008 × 107
Factors of 21991008
Divisors of 21991008
- Number of divisors d(n): 96
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Complete list of divisors:
1 2 3 4 6 8 12 13 16 24 26 32 39 48 52 67 78 96 104 134 156 201 208 263 268 312 402 416 526 536 624 789 804 871 1052 1072 1248 1578 1608 1742 2104 2144 2613 3156 3216 3419 3484 4208 5226 6312 6432 6838 6968 8416 10257 10452 12624 13676 13936 17621 20514 20904 25248 27352 27872 35242 41028 41808 52863 54704 70484 82056 83616 105726 109408 140968 164112 211452 229073 281936 328224 422904 458146 563872 687219 845808 916292 1374438 1691616 1832584 2748876 3665168 5497752 7330336 10995504 21991008
- Sum of all divisors σ(n): 63334656
- Sum of proper divisors (its aliquot sum) s(n): 41343648
- 21991008 is an abundant number, because the sum of its proper divisors (41343648) is greater than itself. Its abundance is 19352640
Bases of 21991008
- Binary: 10100111110001110011000002
- Hexadecimal: 0x14F8E60
- Base-36: D3CDC
Squares and roots of 21991008
- 21991008 squared (219910082) is 483604432856064
- 21991008 cubed (219910083) is 10634948951773166272512
-
The
square root of 21991008 is 4689.4571114363 -
The
cube root of 21991008 is 280.1657522001
Scales and comparisons
How big is 21991008?- 21,991,008 seconds is equal to 36 weeks, 2 days, 12 hours, 36 minutes, 48 seconds.
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To count from 1 to 21,991,008 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 21991008 cubic inches would be around 23.3 feet tall.
Recreational maths with 21991008
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