12821

Names of 12821

• Cardinal: 12821 can be written as Twelve thousand, eight hundred twenty-one.

Scientific notation

• Scientific notation: 1.2821 × 10⁴

Factors of 12821

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 12821

Divisors of 12821

• Number of divisors d(n): 2
• Complete list of divisors:
  1 12821
• Sum of all divisors σ(n): 12822
• Sum of proper divisors (its aliquot sum) s(n): 1
• 12821 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 12820

Bases of 12821

• Binary: 11001000010101₂
• Hexadecimal: 0x3215
• Base-36: 9W5

Squares and roots of 12821

• 12821 squared (12821²) is 164378041
• 12821 cubed (12821³) is 2107490863661
• The square root of 12821 is 113.2298547203
• The cube root of 12821 is 23.4049274937

Scales and comparisons

• 12,821 seconds is equal to 3 hours, 33 minutes, 41 seconds.
• To count from 1 to 12,821 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 12821 cubic inches would be around 2 feet tall.

Recreational maths with 12821

• 12821 is the same when its digits are reversed! That makes it a palindromic prime number.
• 12821 is a twin prime! Its twin is 12823
• The number of decimal digits it has is: 5
• The sum of 12821's digits is 14
• More coming soon!