21078917984

Names of 21078917984

• Cardinal: 21078917984 can be written as Twenty-one billion, seventy-eight million, nine hundred seventeen thousand, nine hundred eighty-four.

Scientific notation

• Scientific notation: 2.1078917984 × 10¹⁰

Factors of 21078917984

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 2912

Divisors of 21078917984

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 4 8 16 17 19 32 34 38 68 76 136 152 272 304 323 544 608 646 1277 1292 1597 2554 2584 3194 5108 5168 6388 10216 10336 12776 20432 21709 24263 25552 27149 30343 40864 43418 48526 51104 54298 60686 86836 97052 108596 121372 173672 194104 217192 242744 347344 388208 412471 434384 485488 515831 694688 776416 824942 868768 970976 1031662 1649884 2039369 2063324 3299768 4078738 4126648 6599536 8157476 8253296 13199072 16314952 16506592 32629904 34669273 38748011 65259808 69338546 77496022 138677092 154992044 277354184 309984088 554708368 619968176 658716187 1109416736 1239936352 1317432374 2634864748 5269729496 10539458992 21078917984
• Sum of all divisors σ(n): 46318093920
• Sum of proper divisors (its aliquot sum) s(n): 25239175936
• 21078917984 is an abundant number, because the sum of its proper divisors (25239175936) is greater than itself. Its abundance is 4160257952

Bases of 21078917984

• Binary: 10011101000011001101100001101100000₂
• Hexadecimal: 0x4E866C360
• Base-36: 9OLUD7K

Squares and roots of 21078917984

• 21078917984 squared (21078917984²) is 444320783376198624256
• 21078917984 cubed (21078917984³) is 9365801351373521418385857019904
• The square root of 21078917984 is 145185.8050361673
• The cube root of 21078917984 is 2762.3758678183

Scales and comparisons

• 21,078,917,984 seconds is equal to 670 years, 12 weeks, 4 days, 22 hours, 59 minutes, 44 seconds.
• To count from 1 to 21,078,917,984 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 21078917984 cubic inches would be around 230.2 feet tall.

Recreational maths with 21078917984

• 21078917984 backwards is 48971987012
• The number of decimal digits it has is: 11
• The sum of 21078917984's digits is 56
• More coming soon!