After few digging into the puzzle specially the first part seems quite difficult
"First 21 digit prime found in consecutive digits of e"
Similar puzzle was done by google in past but with first 10 digit prime and following are the links where that puzzle was solved, these links might give clue for someone trying to solve this riddle;
https://www.jsoftware.com/papers/play211.htmhttp://explorepdx.com/firsten.htmlI think only solving this part won't be enough to get those 2 Bitcoin, answer of this might be than should be used as password to login into Phemex account where you can see 2 BTC.