21021005

Names of 21021005

• Cardinal: 21021005 can be written as Twenty-one million, twenty-one thousand and five.

Scientific notation

• Scientific notation: 2.1021005 × 10⁷

Factors of 21021005

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 15903

Divisors of 21021005

• Number of divisors d(n): 8
• Complete list of divisors:
  1 5 269 1345 15629 78145 4204201 21021005
• Sum of all divisors σ(n): 25320600
• Sum of proper divisors (its aliquot sum) s(n): 4299595
• 21021005 is a deficient number, because the sum of its proper divisors (4299595) is less than itself. Its deficiency is 16721410

Bases of 21021005

• Binary: 1010000001100000101001101₂
• Hexadecimal: 0x140C14D
• Base-36: CIJWT

Squares and roots of 21021005

• 21021005 squared (21021005²) is 441882651210025
• 21021005 cubed (21021005³) is 9288817420499191575125
• The square root of 21021005 is 4584.8669555397
• The cube root of 21021005 is 275.9843730211

Scales and comparisons

• 21,021,005 seconds is equal to 34 weeks, 5 days, 7 hours, 10 minutes, 5 seconds.
• To count from 1 to 21,021,005 would take you about twenty-two 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 21021005 cubic inches would be around 23 feet tall.

Recreational maths with 21021005

• 21021005 backwards is 50012012
• The number of decimal digits it has is: 8
• The sum of 21021005's digits is 11
• More coming soon!