215 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.
What is the sum of the digits of the number 21000?
In [1]:
%timeit sum((int(c) for c in str(2 ** 1000)))
sum((int(c) for c in str(2 ** 1000)))
Out[1]: