21491942

Names of 21491942

• Cardinal: 21491942 can be written as Twenty-one million, four hundred ninety-one thousand, nine hundred forty-two.

Scientific notation

• Scientific notation: 2.1491942 × 10⁷

Factors of 21491942

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 10745973

Divisors of 21491942

• Number of divisors d(n): 4
• Complete list of divisors:
  1 2 10745971 21491942
• Sum of all divisors σ(n): 32237916
• Sum of proper divisors (its aliquot sum) s(n): 10745974
• 21491942 is a deficient number, because the sum of its proper divisors (10745974) is less than itself. Its deficiency is 10745968

Bases of 21491942

• Binary: 1010001111111000011100110₂
• Hexadecimal: 0x147F0E6
• Base-36: CSNAE

Squares and roots of 21491942

• 21491942 squared (21491942²) is 461903570931364
• 21491942 cubed (21491942³) is 9927204756049761068888
• The square root of 21491942 is 4635.9402498303
• The cube root of 21491942 is 278.0301452741

Scales and comparisons

• 21,491,942 seconds is equal to 35 weeks, 3 days, 17 hours, 59 minutes, 2 seconds.
• To count from 1 to 21,491,942 would take you about two days!

  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 21491942 cubic inches would be around 23.2 feet tall.

Recreational maths with 21491942

• 21491942 backwards is 24919412
• The number of decimal digits it has is: 8
• The sum of 21491942's digits is 32
• More coming soon!