21505978420

Names of 21505978420

• Cardinal: 21505978420 can be written as Twenty-one billion, five hundred five million, nine hundred seventy-eight thousand, four hundred twenty.

Scientific notation

• Scientific notation: 2.150597842 × 10¹⁰

Factors of 21505978420

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 6807

Divisors of 21505978420

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 4 5 10 20 23 37 46 74 92 115 148 185 193 230 370 386 460 740 772 851 965 1702 1930 3404 3860 4255 4439 6547 7141 8510 8878 13094 14282 17020 17756 22195 26188 28564 32735 35705 44390 65470 71410 88780 130940 142820 150581 164243 242239 301162 328486 484478 602324 656972 752905 821215 968956 1211195 1263571 1505810 1642430 2422390 2527142 3011620 3284860 4844780 5054284 5571497 6317855 11142994 12635710 22285988 25271420 27857485 29062133 46752127 55714970 58124266 93504254 111429940 116248532 145310665 187008508 233760635 290621330 467521270 581242660 935042540 1075298921 2150597842 4301195684 5376494605 10752989210 21505978420
• Sum of all divisors σ(n): 48658030848
• Sum of proper divisors (its aliquot sum) s(n): 27152052428
• 21505978420 is an abundant number, because the sum of its proper divisors (27152052428) is greater than itself. Its abundance is 5646074008

Bases of 21505978420

• Binary: 10100000001110110110011000000110100₂
• Hexadecimal: 0x501DB3034
• Base-36: 9VO3R5G

Squares and roots of 21505978420

• 21505978420 squared (21505978420²) is 462507107801505696400
• 21505978420 cubed (21505978420³) is 9946667879475795150285471688000
• The square root of 21505978420 is 146649.1678121631
• The cube root of 21505978420 is 2780.9065940557

Scales and comparisons

• 21,505,978,420 seconds is equal to 683 years, 42 weeks, 5 days, 18 hours, 53 minutes, 40 seconds.
• To count from 1 to 21,505,978,420 would take you about one thousand, three hundred sixty-seven 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 21505978420 cubic inches would be around 231.7 feet tall.

Recreational maths with 21505978420

• 21505978420 backwards is 02487950512
• The number of decimal digits it has is: 11
• The sum of 21505978420's digits is 43
• More coming soon!