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.
33. How many even five-digit numbers are there that read the same from left to right and from right to left?