21428157

Names of 21428157

• Cardinal: 21428157 can be written as Twenty-one million, four hundred twenty-eight thousand, one hundred fifty-seven.

Scientific notation

• Scientific notation: 2.1428157 × 10⁷

Factors of 21428157

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 310579

Divisors of 21428157

• Number of divisors d(n): 8
• Complete list of divisors:
  1 3 23 69 310553 931659 7142719 21428157
• Sum of all divisors σ(n): 29813184
• Sum of proper divisors (its aliquot sum) s(n): 8385027
• 21428157 is a deficient number, because the sum of its proper divisors (8385027) is less than itself. Its deficiency is 13043130

Bases of 21428157

• Binary: 1010001101111011110111101₂
• Hexadecimal: 0x146F7BD
• Base-36: CRA2L

Squares and roots of 21428157

• 21428157 squared (21428157²) is 459165912416649
• 21428157 cubed (21428157³) is 9839079260312204185893
• The square root of 21428157 is 4629.0557352445
• The cube root of 21428157 is 277.7548215281

Scales and comparisons

• 21,428,157 seconds is equal to 35 weeks, 3 days, 15 minutes, 57 seconds.
• To count from 1 to 21,428,157 would take you about twenty-three 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 21428157 cubic inches would be around 23.1 feet tall.

Recreational maths with 21428157

• 21428157 backwards is 75182412
• The number of decimal digits it has is: 8
• The sum of 21428157's digits is 30
• More coming soon!