212

This number is a composite.

Besides being the Fahrenheit boiling point of water at sea level, 212 produces a prime of the form k^10+k^9+...+k^2+k+1, when k=212. [Patterson]

The smallest even three-digit integer, abc, such that (abc)/(a*b*c) is also prime. [Patterson]

The boiling point of water in degrees Fahrenheit is the average of emirps 113 and 311. [Green]