# Program 12: Factorial
def main():
    n = int(input("Enter number: "))

    fact = 1

    for i in range(1, n+1):
        fact = fact * i

    print("Factorial is:", fact)

main()

Enter number:  3


Factorial is: 6

# Program 13: Reverse Number
def main():
    num = int(input("Enter number: "))

    rev = 0

    while num > 0:
        digit …

# Program 15: Sum of Digits
def main():
    num = int(input("Enter number: "))

    total = 0

    while num > 0:
        digit = num % 10
        total = total + digit
        num = num // 10

    print("Sum of digits:", total)

main()

Enter number:  12


Sum of digits: 3

# Program 16: Palindrome Number
def main():
    num = int(input("Enter number …