21388290
21,388,290 is an even composite number composed of seven prime numbers multiplied together.
21388290 is an even composite number. It is composed of seven distinct prime numbers multiplied together. It has a total of one hundred twenty-eight divisors.
Prime factorization of 21388290:
2 × 3 × 5 × 7 × 11 × 47 × 197
See below for interesting mathematical facts about the number 21388290 from the Numbermatics database.
Names of 21388290
- Cardinal: 21388290 can be written as Twenty-one million, three hundred eighty-eight thousand, two hundred ninety.
Scientific notation
- Scientific notation: 2.138829 × 107
Factors of 21388290
Divisors of 21388290
- Number of divisors d(n): 128
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Complete list of divisors:
1 2 3 5 6 7 10 11 14 15 21 22 30 33 35 42 47 55 66 70 77 94 105 110 141 154 165 197 210 231 235 282 329 330 385 394 462 470 517 591 658 705 770 985 987 1034 1155 1182 1379 1410 1551 1645 1970 1974 2167 2310 2585 2758 2955 3102 3290 3619 4137 4334 4935 5170 5910 6501 6895 7238 7755 8274 9259 9870 10835 10857 13002 13790 15169 15510 18095 18518 20685 21670 21714 27777 30338 32505 36190 41370 45507 46295 54285 55554 64813 65010 75845 91014 92590 101849 108570 129626 138885 151690 194439 203698 227535 277770 305547 324065 388878 455070 509245 611094 648130 712943 972195 1018490 1425886 1527735 1944390 2138829 3055470 3564715 4277658 7129430 10694145 21388290
- Sum of all divisors σ(n): 65691648
- Sum of proper divisors (its aliquot sum) s(n): 44303358
- 21388290 is an abundant number, because the sum of its proper divisors (44303358) is greater than itself. Its abundance is 22915068
Bases of 21388290
- Binary: 10100011001011100000000102
- Hexadecimal: 0x1465C02
- Base-36: CQFB6
Squares and roots of 21388290
- 21388290 squared (213882902) is 457458949124100
- 21388290 cubed (213882903) is 9784264666961496789000
-
The
square root of 21388290 is 4624.7475606785 -
The
cube root of 21388290 is 277.5824606819
Scales and comparisons
How big is 21388290?- 21,388,290 seconds is equal to 35 weeks, 2 days, 13 hours, 11 minutes, 30 seconds.
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To count from 1 to 21,388,290 would take you about seven hours!
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 21388290 cubic inches would be around 23.1 feet tall.
Recreational maths with 21388290
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The information we have on file for 21388290 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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