21148729

Names of 21148729

• Cardinal: 21148729 can be written as Twenty-one million, one hundred forty-eight thousand, seven hundred twenty-nine.

Scientific notation

• Scientific notation: 2.1148729 × 10⁷

Factors of 21148729

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 159039

Divisors of 21148729

• Number of divisors d(n): 8
• Complete list of divisors:
  1 7 19 133 159013 1113091 3021247 21148729
• Sum of all divisors σ(n): 25442240
• Sum of proper divisors (its aliquot sum) s(n): 4293511
• 21148729 is a deficient number, because the sum of its proper divisors (4293511) is less than itself. Its deficiency is 16855218

Bases of 21148729

• Binary: 1010000101011010000111001₂
• Hexadecimal: 0x142B439
• Base-36: CLAGP

Squares and roots of 21148729

• 21148729 squared (21148729²) is 447268738315441
• 21148729 cubed (21148729³) is 9459165336805178224489
• The square root of 21148729 is 4598.7747281205
• The cube root of 21148729 is 276.5422067249

Scales and comparisons

• 21,148,729 seconds is equal to 34 weeks, 6 days, 18 hours, 38 minutes, 49 seconds.
• To count from 1 to 21,148,729 would take you about three 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 21148729 cubic inches would be around 23 feet tall.

Recreational maths with 21148729

• 21148729 backwards is 92784112
• The number of decimal digits it has is: 8
• The sum of 21148729's digits is 34
• More coming soon!