When the digits of the numbers are added together the result is 2 plus 8 plus 4 plus 2 plus 1 plus 4 21 and when the digits of 21 are then added together the end result is 2 plus 1 3. If the same proc?

It looks like you're describing a process of summing the digits of a series of numbers. The initial sum of the digits you provided results in 21, and when adding the digits of 21 together (2 + 1), you get 3. If you continue this process with other numbers, you would repeatedly sum their digits until reaching a single-digit result, similar to finding the digital root.