About the Number 221 (two hundred twenty-one)

Charles Babbage would have turn 221 years old on 26 December 2012.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   221 is a natural, whole, integer
   221 is odd
   221 proper divisors are: 1,13,17,
   221 is deficient (sum of divisors is 31)
   221 is unhappy
   221 is a Squarefree Number
   221 is not a Harshad number
   221 is not prime
   221 has the prime factors: 13*17 (sum=30)
   221 is semiprime (biprime or 2-almost prime)
   221 sum of prime factors is: 30
   221 is the sum of 9 consecutive primes
   221 = 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41
   221 in octal is 0335
   221 in hexadecimal is 0xdd
   221 in binary is 11011101 (is evil)
   221 nearest square numbers: -25...4 (196...225 [15])
   sqrt(221) = 14.8661
   ln(221) = 5.39816
   log(221) = 2.34439
   221 reciprocal is .00452488687782805429864253393665
   221! is 5.04733e+423
   221 is 70.3465 Pi years
   221 is 11 score and 1 year
   221 written as a Roman numeral is CCXXI
   221 = 111^2 - 110^2 and 111 + 110 = 221

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 26 December 2012 (posted 02 May 2013)

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