21071991

Names of 21071991

• Cardinal: 21071991 can be written as Twenty-one million, seventy-one thousand, nine hundred ninety-one.

Scientific notation

• Scientific notation: 2.1071991 × 10⁷

Factors of 21071991

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 171361

Divisors of 21071991

• Number of divisors d(n): 8
• Complete list of divisors:
  1 3 41 123 171317 513951 7023997 21071991
• Sum of all divisors σ(n): 28781424
• Sum of proper divisors (its aliquot sum) s(n): 7709433
• 21071991 is a deficient number, because the sum of its proper divisors (7709433) is less than itself. Its deficiency is 13362558

Bases of 21071991

• Binary: 1010000011000100001110111₂
• Hexadecimal: 0x1418877
• Base-36: CJN93

Squares and roots of 21071991

• 21071991 squared (21071991²) is 444028804704081
• 21071991 cubed (21071991³) is 9356570976465152495271
• The square root of 21071991 is 4590.4238366407
• The cube root of 21071991 is 276.2073242705

Scales and comparisons

• 21,071,991 seconds is equal to 34 weeks, 5 days, 21 hours, 19 minutes, 51 seconds.
• To count from 1 to 21,071,991 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 21071991 cubic inches would be around 23 feet tall.

Recreational maths with 21071991

• 21071991 backwards is 19917012
• The number of decimal digits it has is: 8
• The sum of 21071991's digits is 30
• More coming soon!