21988989

Names of 21988989

• Cardinal: 21988989 can be written as Twenty-one million, nine hundred eighty-eight thousand, nine hundred eighty-nine.

Scientific notation

• Scientific notation: 2.1988989 × 10⁷

Factors of 21988989

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 103

Divisors of 21988989

• Number of divisors d(n): 80
• Complete list of divisors:
  1 3 9 11 23 27 29 33 37 69 81 87 99 111 207 253 261 297 319 333 407 621 667 759 783 851 891 957 999 1073 1221 1863 2001 2277 2349 2553 2871 2997 3219 3663 6003 6831 7337 7659 8613 9361 9657 10989 11803 18009 20493 22011 22977 24679 25839 28083 28971 32967 35409 54027 66033 68931 74037 84249 86913 106227 198099 222111 252747 271469 318681 594297 666333 758241 814407 956043 1998999 2443221 7329663 21988989
• Sum of all divisors σ(n): 39726720
• Sum of proper divisors (its aliquot sum) s(n): 17737731
• 21988989 is a deficient number, because the sum of its proper divisors (17737731) is less than itself. Its deficiency is 4251258

Bases of 21988989

• Binary: 1010011111000011001111101₂
• Hexadecimal: 0x14F867D
• Base-36: D3AT9

Squares and roots of 21988989

• 21988989 squared (21988989²) is 483515637242121
• 21988989 cubed (21988989³) is 10632020028644989005669
• The square root of 21988989 is 4689.2418363739
• The cube root of 21988989 is 280.1571779081

Scales and comparisons

• 21,988,989 seconds is equal to 36 weeks, 2 days, 12 hours, 3 minutes, 9 seconds.
• To count from 1 to 21,988,989 would take you about two weeks!

  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 21988989 cubic inches would be around 23.3 feet tall.

Recreational maths with 21988989

• 21988989 backwards is 98988912
• The number of decimal digits it has is: 8
• The sum of 21988989's digits is 54
• More coming soon!