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:
 * $10$, $34$, $58$, $85$, $91$, $130$, $214$, $\ldots$