* Find the prime factorization of 216:

216 is divisible by 2: 216 / 2 = 108

108 is divisible by 2: 108 / 2 = 54

54 is divisible by 2: 54 / 2 = 27

27 is divisible by 3: 27 / 3 = 9

9 is divisible by 3: 9 / 3 = 3

3 is divisible by 3: 3 / 3 = 1

So, the prime factorization of 216 is 2 x 2 x 2 x 3 x 3 x 3

* Express the prime factorization in exponential form:

216 = 2³ x 3³

Therefore, 216 can be written in exponential form as 2³ x 3³.