214

Number
$214$ (two hundred and fourteen) is:


 * $2 \times 107$


 * The $31$st nontotient:
 * $\nexists m \in \Z_{>0}: \phi \left({m}\right) = 214$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function


 * The $12$th number after $1, 3, 22, 66, 70, 81, 94, 115, 119, 170, 210$ whose $\sigma$ value is square:


 * The $13$th positive integer which cannot be expressed as the sum of a square and a prime:
 * $1, 10, 25, 34, 58, 64, 85, 91, 121, 130, 169, 196, 214, \ldots$


 * The $7$th non-square positive integer which cannot be expressed as the sum of a square and a prime:
 * $10, 34, 58, 85, 91, 130, 214, \ldots$