21091357

Names of 21091357

• Cardinal: 21091357 can be written as Twenty-one million, ninety-one thousand, three hundred fifty-seven.

Scientific notation

• Scientific notation: 2.1091357 × 10⁷

Factors of 21091357

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 3013058

Divisors of 21091357

• Number of divisors d(n): 4
• Complete list of divisors:
  1 7 3013051 21091357
• Sum of all divisors σ(n): 24104416
• Sum of proper divisors (its aliquot sum) s(n): 3013059
• 21091357 is a deficient number, because the sum of its proper divisors (3013059) is less than itself. Its deficiency is 18078298

Bases of 21091357

• Binary: 1010000011101010000011101₂
• Hexadecimal: 0x141D41D
• Base-36: CK271

Squares and roots of 21091357

• 21091357 squared (21091357²) is 444845340101449
• 21091357 cubed (21091357³) is 9382391877866077076293
• The square root of 21091357 is 4592.5327434869
• The cube root of 21091357 is 276.2919135437

Scales and comparisons

• 21,091,357 seconds is equal to 34 weeks, 6 days, 2 hours, 42 minutes, 37 seconds.
• To count from 1 to 21,091,357 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 21091357 cubic inches would be around 23 feet tall.

Recreational maths with 21091357

• 21091357 backwards is 75319012
• The number of decimal digits it has is: 8
• The sum of 21091357's digits is 28
• More coming soon!