21071990

Names of 21071990

• Cardinal: 21071990 can be written as Twenty-one million, seventy-one thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 2.107199 × 10⁷

Factors of 21071990

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 2107206

Divisors of 21071990

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 5 10 2107199 4214398 10535995 21071990
• Sum of all divisors σ(n): 37929600
• Sum of proper divisors (its aliquot sum) s(n): 16857610
• 21071990 is a deficient number, because the sum of its proper divisors (16857610) is less than itself. Its deficiency is 4214380

Bases of 21071990

• Binary: 1010000011000100001110110₂
• Hexadecimal: 0x1418876
• Base-36: CJN92

Squares and roots of 21071990

• 21071990 squared (21071990²) is 444028762560100
• 21071990 cubed (21071990³) is 9356569644378801599000
• The square root of 21071990 is 4590.4237277183
• The cube root of 21071990 is 276.2073199011

Scales and comparisons

• 21,071,990 seconds is equal to 34 weeks, 5 days, 21 hours, 19 minutes, 50 seconds.
• To count from 1 to 21,071,990 would take you about nineteen 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 21071990 cubic inches would be around 23 feet tall.

Recreational maths with 21071990

• 21071990 backwards is 09917012
• The number of decimal digits it has is: 8
• The sum of 21071990's digits is 29
• More coming soon!