21351440
21,351,440 is an even composite number composed of five prime numbers multiplied together.
21351440 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 21351440:
24 × 5 × 11 × 19 × 1277
(2 × 2 × 2 × 2 × 5 × 11 × 19 × 1277)See below for interesting mathematical facts about the number 21351440 from the Numbermatics database.
Names of 21351440
- Cardinal: 21351440 can be written as Twenty-one million, three hundred fifty-one thousand, four hundred forty.
Scientific notation
- Scientific notation: 2.135144 × 107
Factors of 21351440
Divisors of 21351440
- Number of divisors d(n): 80
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Complete list of divisors:
1 2 4 5 8 10 11 16 19 20 22 38 40 44 55 76 80 88 95 110 152 176 190 209 220 304 380 418 440 760 836 880 1045 1277 1520 1672 2090 2554 3344 4180 5108 6385 8360 10216 12770 14047 16720 20432 24263 25540 28094 48526 51080 56188 70235 97052 102160 112376 121315 140470 194104 224752 242630 266893 280940 388208 485260 533786 561880 970520 1067572 1123760 1334465 1941040 2135144 2668930 4270288 5337860 10675720 21351440
- Sum of all divisors σ(n): 57049920
- Sum of proper divisors (its aliquot sum) s(n): 35698480
- 21351440 is an abundant number, because the sum of its proper divisors (35698480) is greater than itself. Its abundance is 14347040
Bases of 21351440
- Binary: 10100010111001100000100002
- Hexadecimal: 0x145CC10
- Base-36: CPMVK
Squares and roots of 21351440
- 21351440 squared (213514402) is 455883990073600
- 21351440 cubed (213514403) is 9733779661017065984000
-
The
square root of 21351440 is 4620.7618419479 -
The
cube root of 21351440 is 277.4229529357
Scales and comparisons
How big is 21351440?- 21,351,440 seconds is equal to 35 weeks, 2 days, 2 hours, 57 minutes, 20 seconds.
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To count from 1 to 21,351,440 would take you about six 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 21351440 cubic inches would be around 23.1 feet tall.
Recreational maths with 21351440
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