21027821

Names of 21027821

• Cardinal: 21027821 can be written as Twenty-one million, twenty-seven thousand, eight hundred twenty-one.

Scientific notation

• Scientific notation: 2.1027821 × 10⁷

Factors of 21027821

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 31122

Divisors of 21027821

• Number of divisors d(n): 4
• Complete list of divisors:
  1 691 30431 21027821
• Sum of all divisors σ(n): 21058944
• Sum of proper divisors (its aliquot sum) s(n): 31123
• 21027821 is a deficient number, because the sum of its proper divisors (31123) is less than itself. Its deficiency is 20996698

Bases of 21027821

• Binary: 1010000001101101111101101₂
• Hexadecimal: 0x140DBED
• Base-36: CIP65

Squares and roots of 21027821

• 21027821 squared (21027821²) is 442169256008041
• 21027821 cubed (21027821³) is 9297855967040260708661
• The square root of 21027821 is 4585.6102102121
• The cube root of 21027821 is 276.0141988425

Scales and comparisons

• 21,027,821 seconds is equal to 34 weeks, 5 days, 9 hours, 3 minutes, 41 seconds.
• To count from 1 to 21,027,821 would take you about thirty-five minutes!

  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 21027821 cubic inches would be around 23 feet tall.

Recreational maths with 21027821

• 21027821 backwards is 12872012
• The number of decimal digits it has is: 8
• The sum of 21027821's digits is 23
• More coming soon!