21042840
21,042,840 is an even composite number composed of seven prime numbers multiplied together.
21042840 is an even composite number. It is composed of seven distinct prime numbers multiplied together. It has a total of two hundred fifty-six divisors.
Prime factorization of 21042840:
23 × 3 × 5 × 7 × 13 × 41 × 47
(2 × 2 × 2 × 3 × 5 × 7 × 13 × 41 × 47)See below for interesting mathematical facts about the number 21042840 from the Numbermatics database.
Names of 21042840
- Cardinal: 21042840 can be written as Twenty-one million, forty-two thousand, eight hundred forty.
Scientific notation
- Scientific notation: 2.104284 × 107
Factors of 21042840
Divisors of 21042840
- Number of divisors d(n): 256
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Complete list of divisors:
1 2 3 4 5 6 7 8 10 12 13 14 15 20 21 24 26 28 30 35 39 40 41 42 47 52 56 60 65 70 78 82 84 91 94 104 105 120 123 130 140 141 156 164 168 182 188 195 205 210 235 246 260 273 280 282 287 312 328 329 364 376 390 410 420 455 470 492 520 533 546 564 574 611 615 658 705 728 780 820 840 861 910 940 984 987 1066 1092 1128 1148 1222 1230 1316 1365 1410 1435 1560 1599 1640 1645 1722 1820 1833 1880 1927 1974 2132 2184 2296 2444 2460 2632 2665 2730 2820 2870 3055 3198 3290 3444 3640 3666 3731 3854 3948 4264 4277 4305 4888 4920 4935 5330 5460 5640 5740 5781 6110 6396 6580 6888 7332 7462 7708 7896 7995 8554 8610 9165 9635 9870 10660 10920 11193 11480 11562 12220 12792 12831 13160 13489 14664 14924 15416 15990 17108 17220 18330 18655 19270 19740 21320 21385 22386 23124 24440 25051 25662 26978 28905 29848 31980 34216 34440 36660 37310 38540 39480 40467 42770 44772 46248 50102 51324 53956 55965 57810 63960 64155 67445 73320 74620 75153 77080 80934 85540 89544 100204 102648 107912 111930 115620 125255 128310 134890 149240 150306 161868 171080 175357 200408 202335 223860 231240 250510 256620 269780 300612 323736 350714 375765 404670 447720 501020 513240 526071 539560 601224 701428 751530 809340 876785 1002040 1052142 1402856 1503060 1618680 1753570 2104284 2630355 3006120 3507140 4208568 5260710 7014280 10521420 21042840
- Sum of all divisors σ(n): 81285120
- Sum of proper divisors (its aliquot sum) s(n): 60242280
- 21042840 is an abundant number, because the sum of its proper divisors (60242280) is greater than itself. Its abundance is 39199440
Bases of 21042840
- Binary: 10100000100010110100110002
- Hexadecimal: 0x1411698
- Base-36: CJ0RC
Squares and roots of 21042840
- 21042840 squared (210428402) is 442801115265600
- 21042840 cubed (210428403) is 9317793020355578304000
-
The
square root of 21042840 is 4587.2475407373 -
The
cube root of 21042840 is 276.0798970541
Scales and comparisons
How big is 21042840?- 21,042,840 seconds is equal to 34 weeks, 5 days, 13 hours, 14 minutes.
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To count from 1 to 21,042,840 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 21042840 cubic inches would be around 23 feet tall.
Recreational maths with 21042840
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The information we have on file for 21042840 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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