Its just a number. Everyone knows that they have no intention to pay it back. Even if you add 10 more zeros it will have no impact since its worthless.
0*19600000000000 = 0
0*19600000000000000000 = 0
You can add as many zeros you want and it's still just worth what you are paying back, in other words 0
That is the spirit. There is no way the debt will be paid back. The debt will be inflated away, as many governments do in the past centuries.
I also must join the camp of those who say that debt celling numbers matters very little, if at all. That is just a number that goes on the headlines if it pleases to make some plays, but in the big scheme of things when it comes to running the country, it must be extended to infinity. There is no other option in the Keynesian economy.