Is it necessary to sequentially number the podcasts by one? In four years, when you are at episode 1045, that number won’t translate into much.
Can you consider something practical such as 20161031 (yyyyMMdd)? That sorts well and should not overflow an Int32. And you don’t have to say Episode twenty million one hundred and sixty-one thousand and thirty-one. You can just say “Episode for October 31, 2016” You can still keep track of the count in the back end or in some meta data.
Or maybe use Star Date? On second thought, don’t do that. It would annoy me and probably Paul.