33. How many even five-digit numbers are there that read the same from left to right and from right to left?
33. Since the last digit must be even, the first digit will also be even. But the first digit cannot be zero. Therefore, there are only 4 ways to choose the first digit. In total, we get $4 \cdot 10 \cdot 10 \cdot 1 \cdot 1=400$ required even numbers.