21090005

Names of 21090005

• Cardinal: 21090005 can be written as Twenty-one million, ninety thousand and five.

Scientific notation

• Scientific notation: 2.1090005 × 10⁷

Factors of 21090005

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 4218006

Divisors of 21090005

• Number of divisors d(n): 4
• Complete list of divisors:
  1 5 4218001 21090005
• Sum of all divisors σ(n): 25308012
• Sum of proper divisors (its aliquot sum) s(n): 4218007
• 21090005 is a deficient number, because the sum of its proper divisors (4218007) is less than itself. Its deficiency is 16871998

Bases of 21090005

• Binary: 1010000011100111011010101₂
• Hexadecimal: 0x141CED5
• Base-36: CK15H

Squares and roots of 21090005

• 21090005 squared (21090005²) is 444788310900025
• 21090005 cubed (21090005³) is 9380587700823081750125
• The square root of 21090005 is 4592.3855456615
• The cube root of 21090005 is 276.2860097885

Scales and comparisons

• 21,090,005 seconds is equal to 34 weeks, 6 days, 2 hours, 20 minutes, 5 seconds.
• To count from 1 to 21,090,005 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 21090005 cubic inches would be around 23 feet tall.

Recreational maths with 21090005

• 21090005 backwards is 50009012
• The number of decimal digits it has is: 8
• The sum of 21090005's digits is 17
• More coming soon!