How to fetch data from a Text Field with big size integers under a button field?

How to fetch data from a Text Field with big size integers under a button field?

I am fetching data from a Text Field with data 3123123333333333333333314324213432423424 under a button field. I am not getting the exact data on fetching the same.. Tried converting to string. But not getting the desired value. Please provide a solution at the earliest..

My code is as follows:

var s=this.getField("x").value;

var sy=String(this.getField("x").value);

app.alert(s);

app.alert(sy);

I am getting data as 3.122222222222222244e+23 or so.