21289840
21,289,840 is an even composite number composed of five prime numbers multiplied together.
21289840 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of eighty divisors.
Prime factorization of 21289840:
24 × 5 × 11 × 13 × 1861
(2 × 2 × 2 × 2 × 5 × 11 × 13 × 1861)See below for interesting mathematical facts about the number 21289840 from the Numbermatics database.
Names of 21289840
- Cardinal: 21289840 can be written as Twenty-one million, two hundred eighty-nine thousand, eight hundred forty.
Scientific notation
- Scientific notation: 2.128984 × 107
Factors of 21289840
Divisors of 21289840
- Number of divisors d(n): 80
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Complete list of divisors:
1 2 4 5 8 10 11 13 16 20 22 26 40 44 52 55 65 80 88 104 110 130 143 176 208 220 260 286 440 520 572 715 880 1040 1144 1430 1861 2288 2860 3722 5720 7444 9305 11440 14888 18610 20471 24193 29776 37220 40942 48386 74440 81884 96772 102355 120965 148880 163768 193544 204710 241930 266123 327536 387088 409420 483860 532246 818840 967720 1064492 1330615 1637680 1935440 2128984 2661230 4257968 5322460 10644920 21289840
- Sum of all divisors σ(n): 58183776
- Sum of proper divisors (its aliquot sum) s(n): 36893936
- 21289840 is an abundant number, because the sum of its proper divisors (36893936) is greater than itself. Its abundance is 15604096
Bases of 21289840
- Binary: 10100010011011011011100002
- Hexadecimal: 0x144DB70
- Base-36: COBCG
Squares and roots of 21289840
- 21289840 squared (212898402) is 453257287225600
- 21289840 cubed (212898403) is 9649775123867067904000
-
The
square root of 21289840 is 4614.0914598651 -
The
cube root of 21289840 is 277.1559028015
Scales and comparisons
How big is 21289840?- 21,289,840 seconds is equal to 35 weeks, 1 day, 9 hours, 50 minutes, 40 seconds.
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To count from 1 to 21,289,840 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 21289840 cubic inches would be around 23.1 feet tall.
Recreational maths with 21289840
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The information we have on file for 21289840 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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