$24x$ is a multiple of $3$, where $x$ is a digit, what is the value of $x$?

Check the number is divisible by $21$.

$102249$

Check the number is divisible by $21$.

$122472$

Check the number is divisible by $21$.

$5397$

Check the number is divisible by $21$.

$524712$

Check the number is divisible by $6$.

$2560122$

Check the number is divisible by $6$.

$3216$

Check the number is divisible by $6$.

$3520$