Ten trillion is the place value that comes after trillions in the numbering system. The place value after ten trillion would be 100 trillion. It is easy to remember once you learn about place values. You can find more information here: http://www.mazes.com/numberingsystems.html#placevaluechart
1 Additional Answer
After millions, billions and trillions comes quadrillion. Even further after that comes quintillion, sextillion and then septillion. This process can keep going until infinity.