If you were to factor 21, you would get its factors to be 7 and 3. When you multiply these numbers you will get back to 21. This is a result of the Fundamental theorem of arithmetic.
You can read more at:
http://en.wikipedia.org/wiki/Fundamental_theorem_of_arithmetic
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The product of the prime factors of any number is equal to the number itself. Therefore, the product of the prime factors of 350 is 350.
As a product of its prime factors: 225*5 = 100
The product of the prime factors of a number is the number itself.
factors of 21: 3, 7 prime factors of 21: 3, 7
215 as the product of prime factors can be represented as 215 = 5x43