Sorry, but I have'ta say this is not a good idea. IMHO, no 20-something should be looking at any sort of annuity. These no reason for a young-person (or for that matter, anyone still building retirement funds) to tie up their $$ that way, or pay the hefty fees that insurance companies charge for doing what? Managing your investments the same way you could yourself, for free.
They serve a certain niche for those who need the security, but as for me: I'm not a fan.
I have become a huge fan of deferred income annuity. I wish I had learned of it a while ago. I lost half a million in stock market trying to manage it myself. While I know better now that I am a terrible investor and I have turned my money over to a wealth management company several years ago, I began researching deferred income annuity. The payout is something that beats most investments because part of the high returns is due to others dying off and the annuity holder benefiting from it. I just bought 2 annuities. One of them starts in 17 years from now and the payout is greater than 3 times the principal sum. It is conservative and yet the high returns is guaranteed.