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...
Six trillion, under the current international standard (formerly the "short scale").
The "long scale" used by the UK through the early 20th century separated -ion names for numerals by a factor of a...