421

Names of 421

• Cardinal: 421 can be written as Four hundred twenty-one.

Scientific notation

• Scientific notation: 4.21 × 10²

Factors of 421

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 421

Divisors of 421

• Number of divisors d(n): 2
• Complete list of divisors:
  1 421
• Sum of all divisors σ(n): 422
• Sum of proper divisors (its aliquot sum) s(n): 1
• 421 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 420

Bases of 421

• Binary: 110100101₂
• Hexadecimal: 0x1A5
• Base-36: BP

Squares and roots of 421

• 421 squared (421²) is 177241
• 421 cubed (421³) is 74618461
• The square root of 421 is 20.5182845287
• The cube root of 421 is 7.4948112259

Scales and comparisons

• 421 seconds is equal to 7 minutes, 1 second.
• To count from 1 to 421 would take you about 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 421 cubic inches would be around 0.6 feet tall.

Recreational maths with 421

• 421 backwards is 124
• The number of decimal digits it has is: 3
• The sum of 421's digits is 7
• More coming soon!