Pure number palindrome, no string or array

palindrome.py

n = [121, 100, 1337, 404, 33]
def num_digits(n):
    digits = 0
    while n > 0:
        n /= 10
        digits+= 1
    return digits

def is_palindrome(n):
    digits = num_digits(n)
    for x in xrange(digits/2):
        if (n/(10**(digits-x-1)))%10 != (n/(10**(x)))%10:
            return False
    return True
#print is_palindrome(n[2])

for num in n:
    print is_palindrome(num)