21391040
21,391,040 is an even composite number composed of five prime numbers multiplied together.
21391040 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred twelve divisors.
Prime factorization of 21391040:
26 × 5 × 11 × 59 × 103
(2 × 2 × 2 × 2 × 2 × 2 × 5 × 11 × 59 × 103)See below for interesting mathematical facts about the number 21391040 from the Numbermatics database.
Names of 21391040
- Cardinal: 21391040 can be written as Twenty-one million, three hundred ninety-one thousand and forty.
Scientific notation
- Scientific notation: 2.139104 × 107
Factors of 21391040
Divisors of 21391040
- Number of divisors d(n): 112
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Complete list of divisors:
1 2 4 5 8 10 11 16 20 22 32 40 44 55 59 64 80 88 103 110 118 160 176 206 220 236 295 320 352 412 440 472 515 590 649 704 824 880 944 1030 1133 1180 1298 1648 1760 1888 2060 2266 2360 2596 3245 3296 3520 3776 4120 4532 4720 5192 5665 6077 6490 6592 8240 9064 9440 10384 11330 12154 12980 16480 18128 18880 20768 22660 24308 25960 30385 32960 36256 41536 45320 48616 51920 60770 66847 72512 90640 97232 103840 121540 133694 181280 194464 207680 243080 267388 334235 362560 388928 486160 534776 668470 972320 1069552 1336940 1944640 2139104 2673880 4278208 5347760 10695520 21391040
- Sum of all divisors σ(n): 57058560
- Sum of proper divisors (its aliquot sum) s(n): 35667520
- 21391040 is an abundant number, because the sum of its proper divisors (35667520) is greater than itself. Its abundance is 14276480
Bases of 21391040
- Binary: 10100011001100110110000002
- Hexadecimal: 0x14666C0
- Base-36: CQHFK
Squares and roots of 21391040
- 21391040 squared (213910402) is 457576592281600
- 21391040 cubed (213910403) is 9788039188559396864000
-
The
square root of 21391040 is 4625.0448646473 -
The
cube root of 21391040 is 277.5943568961
Scales and comparisons
How big is 21391040?- 21,391,040 seconds is equal to 35 weeks, 2 days, 13 hours, 57 minutes, 20 seconds.
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To count from 1 to 21,391,040 would take you about eight 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 21391040 cubic inches would be around 23.1 feet tall.
Recreational maths with 21391040
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