how do I prevent memory error for the following code

This my python code it's working fine for small values as in primary testcases, but producing Memory Error due to large integer values. How can remove the Memory Error or how do I perform operations with large integers in python please? #taking input testcases T n=int(raw_input()) #taking value range upto iterate and find reversible numbers _input_var = [int(raw_input()) for i in range(0,n)] #function will reverse the number and return def reverse(num): return int(str(num)[::-1]) #function will check odd confirmation for every digit def isDigitOdd(num): lista = str(num) for i in lista: if int(i)%2==0: flag = False return flag else: flag = True return flag #main method def main(_iter): count=0 for i in range(0,_iter): k = i + reverse(i) if i%10!=0 and isDigitOdd(k): count+=1 print count #calling main method for N number ranges for i in _input_var: main(i)