123456789123456789123456+1262727721992

To add the two numbers:

1. 123456789123456789123456
2. 1262727721992

Let's align them and add:

    123456789123456789123456
  +                 1262727721992
---------------------------------------
    123456789124719516845448

So, the sum of 123456789123456789123456 and 1262727721992 is 123456789124719516845448.