21989985

Names of 21989985

• Cardinal: 21989985 can be written as Twenty-one million, nine hundred eighty-nine thousand, nine hundred eighty-five.

Scientific notation

• Scientific notation: 2.1989985 × 10⁷

Factors of 21989985

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 485

Divisors of 21989985

• Number of divisors d(n): 32
• Complete list of divisors:
  1 3 5 15 43 103 129 215 309 331 515 645 993 1545 1655 4429 4965 13287 14233 22145 34093 42699 66435 71165 102279 170465 213495 511395 1465999 4397997 7329995 21989985
• Sum of all divisors σ(n): 36461568
• Sum of proper divisors (its aliquot sum) s(n): 14471583
• 21989985 is a deficient number, because the sum of its proper divisors (14471583) is less than itself. Its deficiency is 7518402

Bases of 21989985

• Binary: 1010011111000101001100001₂
• Hexadecimal: 0x14F8A61
• Base-36: D3BKX

Squares and roots of 21989985

• 21989985 squared (21989985²) is 483559440300225
• 21989985 cubed (21989985³) is 10633464838810343246625
• The square root of 21989985 is 4689.3480357079
• The cube root of 21989985 is 280.1614077879

Scales and comparisons

• 21,989,985 seconds is equal to 36 weeks, 2 days, 12 hours, 19 minutes, 45 seconds.
• To count from 1 to 21,989,985 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 21989985 cubic inches would be around 23.3 feet tall.

Recreational maths with 21989985

• 21989985 backwards is 58998912
• The number of decimal digits it has is: 8
• The sum of 21989985's digits is 51
• More coming soon!