### About the Number 321 (three hundred twenty-one)

This nBAB for the number `321` was created after nBAB# `321` was created for the number 1464 on 25 January 2010. This nBAB about the number `321` was is nBAB 322 and there was already a nBAB for the number 322.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
321 is a natural, whole, integer
321 is odd
321 proper divisors are: 1,3,107,
321 is deficient (sum of divisors is 111)
321 is unhappy
321 is not a Harshad number
321 is not prime
321 has the prime factors: 3*107 (sum=110)
321 is semiprime (biprime or 2-almost prime)
321 sum of prime factors is: 110
321 is a lucky number
321 in octal is 0501
321 in hexadecimal is 0x141
321 in binary is 101000001 (is odious)
321 nearest square numbers: -32...3 (289...324 )
sqrt(321) = 17.9165
ln(321) = 5.77144
log(321) = 2.50651
321 reciprocal is .00311526479750778816199376947040
321! is 6.79269e+666
321 is 102.177 Pi years
321 is 16 score and 1 year
321 written as a Roman numeral is CCCXXI
```

`321` = 161^2 - 160^2 and 161 + 160 = 321

It is quick to check that `321` is a multiple of three because the sum of its digits is six and six is a multiple of three.

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 25 January 2010 