number_to_string(n, @optional radix = 10)
Return the external representation of the number n as a string.
The number is expressed in radix, which must be an exact integer from the set #(2, 8, 10, 16).
Radix defaults to 10. In any case, no radix specifier will appear in the resulting string.
number_to_string(221/12)
// 221/12
string_length(number_to_string(221/12))
// 6
number_to_string(221/12, 16)
// dd/c