21981440
21,981,440 is an even composite number composed of four prime numbers multiplied together.
21981440 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of seventy-two divisors.
Prime factorization of 21981440:
28 × 5 × 13 × 1321
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 13 × 1321)See below for interesting mathematical facts about the number 21981440 from the Numbermatics database.
Names of 21981440
- Cardinal: 21981440 can be written as Twenty-one million, nine hundred eighty-one thousand, four hundred forty.
Scientific notation
- Scientific notation: 2.198144 × 107
Factors of 21981440
Divisors of 21981440
- Number of divisors d(n): 72
-
Complete list of divisors:
1 2 4 5 8 10 13 16 20 26 32 40 52 64 65 80 104 128 130 160 208 256 260 320 416 520 640 832 1040 1280 1321 1664 2080 2642 3328 4160 5284 6605 8320 10568 13210 16640 17173 21136 26420 34346 42272 52840 68692 84544 85865 105680 137384 169088 171730 211360 274768 338176 343460 422720 549536 686920 845440 1099072 1373840 1690880 2198144 2747680 4396288 5495360 10990720 21981440
- Sum of all divisors σ(n): 56745528
- Sum of proper divisors (its aliquot sum) s(n): 34764088
- 21981440 is an abundant number, because the sum of its proper divisors (34764088) is greater than itself. Its abundance is 12782648
Bases of 21981440
- Binary: 10100111101101001000000002
- Hexadecimal: 0x14F6900
- Base-36: D34ZK
Squares and roots of 21981440
- 21981440 squared (219814402) is 483183704473600
- 21981440 cubed (219814403) is 10621073608864169984000
-
The
square root of 21981440 is 4688.4368397153 -
The
cube root of 21981440 is 280.1251141541
Scales and comparisons
How big is 21981440?- 21,981,440 seconds is equal to 36 weeks, 2 days, 9 hours, 57 minutes, 20 seconds.
-
To count from 1 to 21,981,440 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 21981440 cubic inches would be around 23.3 feet tall.
Recreational maths with 21981440
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The information we have on file for 21981440 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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