The natural number $m$, for which the coefficient of $x$ in the binomial expansion of $\left( x ^ { m } + \frac { 1 } { x ^ { 2 } } \right) ^ { 22 }$ is 1540, is
The natural number $m$, for which the coefficient of $x$ in the binomial expansion of $\left( x ^ { m } + \frac { 1 } { x ^ { 2 } } \right) ^ { 22 }$ is 1540, is