21239892729

Names of 21239892729

• Cardinal: 21239892729 can be written as Twenty-one billion, two hundred thirty-nine million, eight hundred ninety-two thousand, seven hundred twenty-nine.

Scientific notation

• Scientific notation: 2.1239892729 × 10¹⁰

Factors of 21239892729

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 1172

Divisors of 21239892729

• Number of divisors d(n): 96
• Complete list of divisors:
  1 3 9 11 19 33 53 57 99 159 171 209 257 477 583 627 771 829 1007 1749 1881 2313 2487 2827 3021 4883 5247 7461 8481 9063 9119 11077 13621 14649 15751 25443 27357 33231 40863 43937 43947 47253 53713 82071 99693 122589 131811 141759 149831 161139 173261 213053 258799 395433 449493 483307 483417 519783 639159 776397 834803 1348479 1449921 1559349 1917477 2329191 2343583 2504409 2846789 4048007 4349763 7030749 7513227 8540367 9182833 11291809 12144021 21092247 25621101 27548499 33875427 36432063 44528077 82645497 101626281 124209899 133584231 214544371 372629697 400752693 643633113 1117889091 1930899339 2359988081 7079964243 21239892729
• Sum of all divisors σ(n): 36078307200
• Sum of proper divisors (its aliquot sum) s(n): 14838414471
• 21239892729 is a deficient number, because the sum of its proper divisors (14838414471) is less than itself. Its deficiency is 6401478258

Bases of 21239892729

• Binary: 10011110001111111110000101011111001₂
• Hexadecimal: 0x4F1FF0AF9
• Base-36: 9R9OM49

Squares and roots of 21239892729

• 21239892729 squared (21239892729²) is 451133043139427067441
• 21239892729 cubed (21239892729³) is 9582017442788760302965888536489
• The square root of 21239892729 is 145739.1255943303
• The cube root of 21239892729 is 2769.3899149913

Scales and comparisons

• 21,239,892,729 seconds is equal to 675 years, 18 weeks, 6 days, 2 hours, 12 minutes, 9 seconds.
• To count from 1 to 21,239,892,729 would take you about one thousand, three hundred fifty 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 21239892729 cubic inches would be around 230.8 feet tall.

Recreational maths with 21239892729

• 21239892729 backwards is 92729893212
• The number of decimal digits it has is: 11
• The sum of 21239892729's digits is 54
• More coming soon!