21157137920

Names of 21157137920

• Cardinal: 21157137920 can be written as Twenty-one billion, one hundred fifty-seven million, one hundred thirty-seven thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 2.115713792 × 10¹⁰

Factors of 21157137920

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 14
• Sum of prime factors: 384

Divisors of 21157137920

• Number of divisors d(n): 240
• Complete list of divisors:
  1 2 4 5 8 10 16 20 29 31 32 40 58 62 64 80 116 124 128 145 155 160 232 248 256 290 310 317 320 464 496 512 580 620 634 640 841 899 928 992 1160 1240 1268 1280 1585 1682 1798 1856 1984 2320 2480 2536 2560 3170 3364 3596 3712 3968 4205 4495 4640 4960 5072 6340 6728 7192 7424 7936 8410 8990 9193 9280 9827 9920 10144 12680 13456 14384 14848 15872 16820 17980 18386 18560 19654 19840 20288 25360 26071 26912 28768 33640 35960 36772 37120 39308 39680 40576 45965 49135 50720 52142 53824 57536 67280 71920 73544 74240 78616 79360 81152 91930 98270 101440 104284 107648 115072 130355 134560 143840 147088 157232 162304 183860 196540 202880 208568 215296 230144 260710 266597 269120 284983 287680 294176 314464 367720 393080 405760 417136 430592 460288 521420 533194 538240 569966 575360 588352 628928 735440 786160 811520 834272 1042840 1066388 1076480 1139932 1150720 1176704 1257856 1332985 1424915 1470880 1572320 1668544 2085680 2132776 2152960 2279864 2301440 2353408 2515712 2665970 2849830 2941760 3144640 3337088 4171360 4265552 4559728 4706816 5031424 5331940 5699660 5883520 6289280 6674176 8264507 8342720 8531104 9119456 10663880 11399320 11767040 12578560 13348352 16529014 16685440 17062208 18238912 21327760 22798640 23534080 25157120 33058028 33370880 34124416 36477824 41322535 42655520 45597280 66116056 66741760 68248832 72955648 82645070 85311040 91194560 132232112 136497664 145911296 165290140 170622080 182389120 264464224 330580280 341244160 364778240 528928448 661160560 682488320 729556480 1057856896 1322321120 2115713792 2644642240 4231427584 5289284480 10578568960 21157137920
• Sum of all divisors σ(n): 54402910848
• Sum of proper divisors (its aliquot sum) s(n): 33245772928
• 21157137920 is an abundant number, because the sum of its proper divisors (33245772928) is greater than itself. Its abundance is 12088635008

Bases of 21157137920

• Binary: 10011101101000100000100111000000000₂
• Hexadecimal: 0x4ED104E00
• Base-36: 9PWEW3K

Squares and roots of 21157137920

• 21157137920 squared (21157137920²) is 447624484965901926400
• 21157137920 cubed (21157137920³) is 9470452964792553554038489088000
• The square root of 21157137920 is 145454.9343267529
• The cube root of 21157137920 is 2765.7885373659

Scales and comparisons

• 21,157,137,920 seconds is equal to 672 years, 38 weeks, 6 hours, 45 minutes, 20 seconds.
• To count from 1 to 21,157,137,920 would take you about one thousand, three hundred forty-five 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 21157137920 cubic inches would be around 230.5 feet tall.

Recreational maths with 21157137920

• 21157137920 backwards is 02973175112
• The number of decimal digits it has is: 11
• The sum of 21157137920's digits is 38
• More coming soon!