21418720015

Names of 21418720015

• Cardinal: 21418720015 can be written as Twenty-one billion, four hundred eighteen million, seven hundred twenty thousand and fifteen.

Scientific notation

• Scientific notation: 2.1418720015 × 10¹⁰

Factors of 21418720015

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 1811

Divisors of 21418720015

• Number of divisors d(n): 72
• Complete list of divisors:
  1 5 7 11 35 49 55 77 121 245 385 539 605 617 847 1171 2695 3085 4235 4319 5855 5929 6787 8197 12881 21595 29645 30233 33935 40985 47509 57379 64405 74657 90167 141691 151165 237545 286895 332563 373285 450835 522599 631169 708455 722507 991837 1662815 2612995 3155845 3612535 3658193 4959185 5057549 6942859 7947577 18290965 25287745 34714295 35402843 39737885 55633039 87423347 177014215 278165195 389431273 437116735 611963429 1947156365 3059817145 4283744003 21418720015
• Sum of all divisors σ(n): 32945327856
• Sum of proper divisors (its aliquot sum) s(n): 11526607841
• 21418720015 is a deficient number, because the sum of its proper divisors (11526607841) is less than itself. Its deficiency is 9892112174

Bases of 21418720015

• Binary: 10011111100101001111011101100001111₂
• Hexadecimal: 0x4FCA7BB0F
• Base-36: 9U85I4V

Squares and roots of 21418720015

• 21418720015 squared (21418720015²) is 458761567080961600225
• 21418720015 cubed (21418720015³) is 9826085558949757352185636003375
• The square root of 21418720015 is 146351.3580907265
• The cube root of 21418720015 is 2777.1404102655

Scales and comparisons

• 21,418,720,015 seconds is equal to 681 years, 2 weeks, 3 days, 20 hours, 26 minutes, 55 seconds.
• To count from 1 to 21,418,720,015 would take you about one thousand, three hundred sixty-two 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 21418720015 cubic inches would be around 231.4 feet tall.

Recreational maths with 21418720015

• 21418720015 backwards is 51002781412
• The number of decimal digits it has is: 11
• The sum of 21418720015's digits is 31
• More coming soon!