To find the missing number \( x \) in the equation:
\[ x \times 0.01 = 25.35 \]
We can isolate \( x \) by dividing both sides of the equation by \( 0.01 \):
\[ x = \frac{25.35}{0.01} \]
Calculating the right side:
\[ x = 25.35 \div 0.01 = 25.35 \times 100 = 2535 \]
Thus, the missing number is:
\[ \boxed{2535} \]