[Precalculus] Convert to polar form

I know that but how do you convert 2^i to polar form?

I am not entirely sure, but I looked at this website to understand polar form. The website also gives an example of an irrational complex number in polar form.

Also here

I know how to convert standard complex numbers in the form of a+bi to polar form. What confuses me here is the fact that 2^i is not in the standard complex number form