21145165720
21,145,165,720 is an even composite number composed of seven prime numbers multiplied together.
21145165720 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 21145165720:
23 × 5 × 7 × 31 × 43 × 181 × 313
(2 × 2 × 2 × 5 × 7 × 31 × 43 × 181 × 313)See below for interesting mathematical facts about the number 21145165720 from the Numbermatics database.
Names of 21145165720
- Cardinal: 21145165720 can be written as Twenty-one billion, one hundred forty-five million, one hundred sixty-five thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 2.114516572 × 1010
Factors of 21145165720
Divisors of 21145165720
- Number of divisors d(n): 256
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Complete list of divisors:
1 2 4 5 7 8 10 14 20 28 31 35 40 43 56 62 70 86 124 140 155 172 181 215 217 248 280 301 310 313 344 362 430 434 602 620 626 724 860 868 905 1085 1204 1240 1252 1267 1333 1448 1505 1565 1720 1736 1810 2170 2191 2408 2504 2534 2666 3010 3130 3620 4340 4382 5068 5332 5611 6020 6260 6335 6665 7240 7783 8680 8764 9331 9703 10136 10664 10955 11222 12040 12520 12670 13330 13459 15566 17528 18662 19406 21910 22444 25340 26660 26918 28055 31132 37324 38812 38915 39277 43820 44888 46655 48515 50680 53320 53836 54481 56110 56653 62264 67295 67921 74648 77624 77830 78554 87640 93310 94213 97030 107672 108962 112220 113306 134590 135842 155660 157108 186620 188426 194060 196385 217924 224440 226612 241273 269180 271684 272405 283265 311320 314216 339605 373240 376852 388120 392770 396571 417229 435848 453224 471065 482546 538360 543368 544810 566530 679210 753704 785540 793142 834458 942130 965092 1089620 1133060 1206365 1358420 1571080 1586284 1668916 1688911 1756243 1884260 1930184 1982855 2086145 2179240 2266120 2412730 2436079 2716840 2920603 3172568 3337832 3377822 3512486 3768520 3965710 4172290 4825460 4872158 5841206 6755644 7024972 7931420 8344580 8444555 8781215 9650920 9744316 11682412 12180395 12293701 13511288 14049944 14603015 15862840 16689160 16889110 17052553 17562430 19488632 23364824 24360790 24587402 29206030 33778220 34105106 35124860 48721580 49174804 58412060 61468505 67556440 68210212 70249720 75518449 85262765 97443160 98349608 116824120 122937010 136420424 151036898 170525530 245874020 302073796 341051060 377592245 491748040 528629143 604147592 682102120 755184490 1057258286 1510368980 2114516572 2643145715 3020737960 4229033144 5286291430 10572582860 21145165720
- Sum of all divisors σ(n): 57934356480
- Sum of proper divisors (its aliquot sum) s(n): 36789190760
- 21145165720 is an abundant number, because the sum of its proper divisors (36789190760) is greater than itself. Its abundance is 15644025040
Bases of 21145165720
- Binary: 100111011000101100110011111100110002
- Hexadecimal: 0x4EC599F98
- Base-36: 9PPAAAG
Squares and roots of 21145165720
- 21145165720 squared (211451657202) is 447118033326263118400
- 21145165720 cubed (211451657203) is 9454384911084316466891981248000
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The
square root of 21145165720 is 145413.7741756261 -
The
cube root of 21145165720 is 2765.2667462265
Scales and comparisons
How big is 21145165720?- 21,145,165,720 seconds is equal to 672 years, 18 weeks, 1 day, 17 hours, 8 minutes, 40 seconds.
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To count from 1 to 21,145,165,720 would take you about one thousand, three hundred forty-four years!
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 21145165720 cubic inches would be around 230.4 feet tall.
Recreational maths with 21145165720
- 21145165720 backwards is 02756154112
- The number of decimal digits it has is: 11
- The sum of 21145165720's digits is 34
- More coming soon!
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