trillionfold

Adjective

 * 1) By a multiple of one trillion; by a trillion times as much or as many.
 * The volume occupied by the star's exploding gases underwent a trillionfold increase.

Adverb

 * 1) By a factor of one trillion.
 * The national debt has ballooned trillionfold in the past century.

Usage notes
Both the adjective and the adverb are often used as hyperbole, indicating not literally a trillion, but rather some vague inestimable number or amount.