It'd be hard to argue that Citigroup (C 1.33%) is the safest of the big banks, but that doesn't mean investors should automatically skip over the bank's stock. To be sure, the fact that many investors are indiscriminately ignoring Citi may be creating an opportunity in the stock.

There certainly are big risks facing Citigroup and its shareholders, and it'd be silly to overlook them. However, there are some compelling reasons to think that Citi's stock may be a buy, and I discuss three of those reasons in the video below.