### 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 )
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) 