21389977

Names of 21389977

• Cardinal: 21389977 can be written as Twenty-one million, three hundred eighty-nine thousand, nine hundred seventy-seven.

Scientific notation

• Scientific notation: 2.1389977 × 10⁷

Factors of 21389977

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 132887

Divisors of 21389977

• Number of divisors d(n): 8
• Complete list of divisors:
  1 7 23 161 132857 929999 3055711 21389977
• Sum of all divisors σ(n): 25508736
• Sum of proper divisors (its aliquot sum) s(n): 4118759
• 21389977 is a deficient number, because the sum of its proper divisors (4118759) is less than itself. Its deficiency is 17271218

Bases of 21389977

• Binary: 1010001100110001010011001₂
• Hexadecimal: 0x1466299
• Base-36: CQGM1

Squares and roots of 21389977

• 21389977 squared (21389977²) is 457531116060529
• 21389977 cubed (21389977³) is 9786580049319045917833
• The square root of 21389977 is 4624.9299454153
• The cube root of 21389977 is 277.5897585895

Scales and comparisons

• 21,389,977 seconds is equal to 35 weeks, 2 days, 13 hours, 39 minutes, 37 seconds.
• To count from 1 to 21,389,977 would take you about eight hours!

  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 21389977 cubic inches would be around 23.1 feet tall.

Recreational maths with 21389977

• 21389977 backwards is 77998312
• The number of decimal digits it has is: 8
• The sum of 21389977's digits is 46
• More coming soon!