That depends on where the term is in use. In some parts of the world, a "million million", or 1000000000000 would be referred to as a "billion". In other parts of the world, it is referred to as a...
It is estimated that, in 2009, there were 7.8 million people in the United States with a personal net worth (not including the value of their primary residence) of one million dollars or more.