21181994743

Names of 21181994743

• Cardinal: 21181994743 can be written as Twenty-one billion, one hundred eighty-one million, nine hundred ninety-four thousand, seven hundred forty-three.

Scientific notation

• Scientific notation: 2.1181994743 × 10¹⁰

Factors of 21181994743

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 917

Divisors of 21181994743

• Number of divisors d(n): 72
• Complete list of divisors:
  1 7 13 31 49 91 109 169 217 403 637 757 763 1183 1417 1519 2821 3379 5239 5299 5341 8281 9841 9919 18421 19747 23467 23653 36673 37093 43927 68887 69433 82513 127933 128947 164269 165571 256711 305071 307489 482209 571051 577591 895531 902629 1072669 1149883 2135497 2152423 2557903 3965923 3997357 4043137 6268717 7508683 13944697 14948479 17905321 27761461 27981499 33252739 52560781 97612879 125337247 194330227 232769173 432285607 683290153 1629384211 3025999249 21181994743
• Sum of all divisors σ(n): 27831576960
• Sum of proper divisors (its aliquot sum) s(n): 6649582217
• 21181994743 is a deficient number, because the sum of its proper divisors (6649582217) is less than itself. Its deficiency is 14532412526

Bases of 21181994743

• Binary: 10011101110100010111001011011110111₂
• Hexadecimal: 0x4EE8B96F7
• Base-36: 9QB7NQV

Squares and roots of 21181994743

• 21181994743 squared (21181994743²) is 448676901292479636049
• 21181994743 cubed (21181994743³) is 9503871764482833556224471290407
• The square root of 21181994743 is 145540.3543454529
• The cube root of 21181994743 is 2766.8712580127

Scales and comparisons

• 21,181,994,743 seconds is equal to 673 years, 27 weeks, 23 hours, 25 minutes, 43 seconds.
• To count from 1 to 21,181,994,743 would take you about one thousand, three hundred forty-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 21181994743 cubic inches would be around 230.6 feet tall.

Recreational maths with 21181994743

• 21181994743 backwards is 34749918112
• 21181994743 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21181994743's digits is 49
• More coming soon!