12721

Names of 12721

• Cardinal: 12721 can be written as Twelve thousand, seven hundred twenty-one.

Scientific notation

• Scientific notation: 1.2721 × 10⁴

Factors of 12721

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 12721

Divisors of 12721

• Number of divisors d(n): 2
• Complete list of divisors:
  1 12721
• Sum of all divisors σ(n): 12722
• Sum of proper divisors (its aliquot sum) s(n): 1
• 12721 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 12720

Bases of 12721

• Binary: 11000110110001₂
• Hexadecimal: 0x31B1
• Base-36: 9TD

Squares and roots of 12721

• 12721 squared (12721²) is 161823841
• 12721 cubed (12721³) is 2058561081361
• The square root of 12721 is 112.7874106449
• The cube root of 12721 is 23.3439180999

Scales and comparisons

• 12,721 seconds is equal to 3 hours, 32 minutes, 1 second.
• To count from 1 to 12,721 would take you about three hours.

  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 12721 cubic inches would be around 1.9 feet tall.

Recreational maths with 12721

• 12721 is the same when its digits are reversed! That makes it a palindromic prime number.
• The number of decimal digits it has is: 5
• The sum of 12721's digits is 13
• More coming soon!