21078947890

Names of 21078947890

• Cardinal: 21078947890 can be written as Twenty-one billion, seventy-eight million, nine hundred forty-seven thousand, eight hundred ninety.

Scientific notation

• Scientific notation: 2.107894789 × 10¹⁰

Factors of 21078947890

• Number of distinct prime factors ω(n): 8
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 351

Divisors of 21078947890

• Number of divisors d(n): 384
• Complete list of divisors:
  1 2 5 7 10 11 13 14 19 22 26 35 38 49 55 65 70 71 77 91 95 98 110 130 133 142 143 154 182 190 209 223 245 247 266 286 355 385 418 446 455 490 494 497 539 637 665 710 715 770 781 910 923 931 994 1001 1045 1078 1115 1235 1274 1330 1349 1430 1463 1561 1562 1729 1846 1862 2002 2090 2230 2453 2470 2485 2695 2698 2717 2899 2926 3122 3185 3458 3479 3905 4237 4615 4655 4906 4970 5005 5390 5434 5467 5798 6370 6461 6745 6958 7007 7315 7805 7810 8474 8645 9230 9310 9443 10010 10153 10241 10927 10934 12103 12265 12922 13490 13585 14014 14495 14630 14839 15610 15833 17171 17290 17395 17537 18886 19019 20293 20306 20482 21185 21854 24206 24530 27170 27335 28990 29659 29678 31666 31889 32305 34342 34790 35035 35074 38038 38269 40586 42370 45227 46607 47215 50765 51205 54635 54670 55081 59318 60515 63778 64610 66101 70070 71071 74195 76538 79165 85855 87685 90454 93214 94430 95095 101465 101530 102410 103873 109270 110162 110831 120197 121030 122759 132202 133133 142051 142142 148295 148390 158330 159445 171710 174163 175370 190190 191345 192907 202930 205829 207613 207746 221662 223223 226135 233035 240394 245518 266266 275405 284102 296590 300827 318890 326249 330505 348326 355355 382690 385567 385814 411658 415226 446446 452270 466070 497497 519365 550810 554155 600985 601654 605891 613795 652498 661010 665665 710255 710710 727111 771134 775817 859313 870815 964535 994994 1029145 1038065 1038730 1108310 1116115 1201970 1211782 1219141 1227590 1331330 1350349 1420510 1440803 1454222 1504135 1551634 1562561 1631245 1718626 1741630 1927835 1929070 2058290 2076130 2105789 2232230 2264119 2283743 2438282 2487485 2698969 2700698 2881606 3008270 3029455 3125122 3262490 3309097 3635555 3855670 3879085 3910751 4211578 4241237 4296565 4528238 4567486 4974970 5397938 6058910 6095705 6618194 6751745 7204015 7271110 7758170 7812805 7821502 8482474 8533987 8593130 9452443 10085621 10528945 11320595 11418715 12191410 13494845 13503490 14408030 14740523 15625610 15848833 16545485 17067974 18904886 19553755 20171242 21057890 21206185 22641190 22837430 23163679 26989690 27375257 29481046 29688659 31697666 33090970 39107510 42412370 42669935 43018261 46327358 47262215 50428105 54750514 59377318 73702615 79244165 85339870 86036522 94524430 100856210 110941831 115818395 136876285 147405230 148443295 158488330 162145753 191626799 215091305 221883662 231636790 273752570 296886590 301127827 324291506 383253598 430182610 554709155 602255654 810728765 958133995 1109418310 1505639135 1621457530 1916267990 2107894789 3011278270 4215789578 10539473945 21078947890
• Sum of all divisors σ(n): 55599022080
• Sum of proper divisors (its aliquot sum) s(n): 34520074190
• 21078947890 is an abundant number, because the sum of its proper divisors (34520074190) is greater than itself. Its abundance is 13441126300

Bases of 21078947890

• Binary: 10011101000011001110011100000110010₂
• Hexadecimal: 0x4E8673832
• Base-36: 9OLV0AA

Squares and roots of 21078947890

• 21078947890 squared (21078947890²) is 444322044149335452100
• 21078947890 cubed (21078947890³) is 9365841215002121372945491069000
• The square root of 21078947890 is 145185.9080282931
• The cube root of 21078947890 is 2762.3771742037

Scales and comparisons

• 21,078,947,890 seconds is equal to 670 years, 12 weeks, 5 days, 7 hours, 18 minutes, 10 seconds.
• To count from 1 to 21,078,947,890 would take you about one thousand, three hundred forty 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 21078947890 cubic inches would be around 230.2 feet tall.

Recreational maths with 21078947890

• 21078947890 backwards is 09874987012
• 21078947890 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21078947890's digits is 55
• More coming soon!