21042757

Names of 21042757

• Cardinal: 21042757 can be written as Twenty-one million, forty-two thousand, seven hundred fifty-seven.

Scientific notation

• Scientific notation: 2.1042757 × 10⁷

Factors of 21042757

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 2667

Divisors of 21042757

• Number of divisors d(n): 8
• Complete list of divisors:
  1 67 127 2473 8509 165691 314071 21042757
• Sum of all divisors σ(n): 21533696
• Sum of proper divisors (its aliquot sum) s(n): 490939
• 21042757 is a deficient number, because the sum of its proper divisors (490939) is less than itself. Its deficiency is 20551818

Bases of 21042757

• Binary: 1010000010001011001000101₂
• Hexadecimal: 0x1411645
• Base-36: CJ0P1

Squares and roots of 21042757

• 21042757 squared (21042757²) is 442797622161049
• 21042757 cubed (21042757³) is 9317682763312768972093
• The square root of 21042757 is 4587.2384939089
• The cube root of 21042757 is 276.0795340695

Scales and comparisons

• 21,042,757 seconds is equal to 34 weeks, 5 days, 13 hours, 12 minutes, 37 seconds.
• To count from 1 to 21,042,757 would take you about seven 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 21042757 cubic inches would be around 23 feet tall.

Recreational maths with 21042757

• 21042757 backwards is 75724012
• The number of decimal digits it has is: 8
• The sum of 21042757's digits is 28
• More coming soon!