What is the value of a 1921american silver eagle dollar?

Answer 1

No such thing exists. There are 2 types of dollars issued in 1921, none of which are silver eagles (the silver eagle bullion coin program wouldn't be created till the 1980s) so you need to post a new question (or search for, because the question has been asked multiple times) telling if you have a Morgan dollar or a Peace dollar. Morgan dollars have the eagle on the reverse with wings spread surrounded by a wreath and are common and only worth about $25 for silver content. Peace dollars have an eagle perched on a rock inscribed PEACE and are more rare and are worth differing amounts depending on the wear on the coin.