Aditi sorted the numbers 21 to 34 into the Venn diagram (only some are shown). Exactly ONE number is in the wrong region. Which one?

The overlap needs numbers divisible by both 2 and 3. 32 is even, but $3+2=5$ is not a multiple of 3, so 32 belongs in 'Divisible by 2' only. 24 and 30 are correct in the overlap; 27 and 25 are also placed correctly.