def Conversion(num,base):
    if num == 0:
        return ""
    else:
        remainder = (num % base)
        remainder = str(remainder)
        remainder = remainder + str(Conversion((num - int(remainder)) // base, base))
    return remainder
print(Conversion(153,4))

My code outputs 1212 instead of 2121

I tried to concatenate the remainder string with a recursively called version of the same code but 1 goes first for some reason