21028643

Names of 21028643

• Cardinal: 21028643 can be written as Twenty-one million, twenty-eight thousand, six hundred forty-three.

Scientific notation

• Scientific notation: 2.1028643 × 10⁷

Factors of 21028643

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1236996

Divisors of 21028643

• Number of divisors d(n): 4
• Complete list of divisors:
  1 17 1236979 21028643
• Sum of all divisors σ(n): 22265640
• Sum of proper divisors (its aliquot sum) s(n): 1236997
• 21028643 is a deficient number, because the sum of its proper divisors (1236997) is less than itself. Its deficiency is 19791646

Bases of 21028643

• Binary: 1010000001101111100100011₂
• Hexadecimal: 0x140DF23
• Base-36: CIPSZ

Squares and roots of 21028643

• 21028643 squared (21028643²) is 442203826421449
• 21028643 cubed (21028643³) is 9298946399050618563707
• The square root of 21028643 is 4585.6998375385
• The cube root of 21028643 is 276.0177953589

Scales and comparisons

• 21,028,643 seconds is equal to 34 weeks, 5 days, 9 hours, 17 minutes, 23 seconds.
• To count from 1 to 21,028,643 would take you about fifty-six minutes!

  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 21028643 cubic inches would be around 23 feet tall.

Recreational maths with 21028643

• 21028643 backwards is 34682012
• The number of decimal digits it has is: 8
• The sum of 21028643's digits is 26
• More coming soon!