After a trillion, the next number is a quadrillion, which is 1 with 15 zeros after it. Here is a list of large numbers that come after a trillion:

• Quadrillion: 1 with 15 zeros after it
• Quintillion: 1 with 18 zeros after it
• Sextillion: 1 with 21 zeros after it
• Septillion: 1 with 24 zeros after it
• Octillion: 1 with 27 zeros after it
• Nonillion: 1 with 30 zeros after it
• Decillion: 1 with 33 zeros after it

There are many other large numbers between trillion and quadrillion, but they all include the word "trillion". Its also worth noting that different naming systems exist for large numbers, such as the short scale and the long scale, which can lead to some confusion.