21152440

Names of 21152440

• Cardinal: 21152440 can be written as Twenty-one million, one hundred fifty-two thousand, four hundred forty.

Scientific notation

• Scientific notation: 2.115244 × 10⁷

Factors of 21152440

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 528818

Divisors of 21152440

• Number of divisors d(n): 16
• Complete list of divisors:
  1 2 4 5 8 10 20 40 528811 1057622 2115244 2644055 4230488 5288110 10576220 21152440
• Sum of all divisors σ(n): 47593080
• Sum of proper divisors (its aliquot sum) s(n): 26440640
• 21152440 is an abundant number, because the sum of its proper divisors (26440640) is greater than itself. Its abundance is 5288200

Bases of 21152440

• Binary: 1010000101100001010111000₂
• Hexadecimal: 0x142C2B8
• Base-36: CLDBS

Squares and roots of 21152440

• 21152440 squared (21152440²) is 447425717953600
• 21152440 cubed (21152440³) is 9464145653470446784000
• The square root of 21152440 is 4599.1781874591
• The cube root of 21152440 is 276.5583808745

Scales and comparisons

• 21,152,440 seconds is equal to 34 weeks, 6 days, 19 hours, 40 minutes, 40 seconds.
• To count from 1 to 21,152,440 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 21152440 cubic inches would be around 23 feet tall.

Recreational maths with 21152440

• 21152440 backwards is 04425112
• The number of decimal digits it has is: 8
• The sum of 21152440's digits is 19
• More coming soon!