Does using ceil or floor, will increase the chances of collision of generated random number in case generateRandomNumber2

Also which function works better so that collision not occurs?

 function generateRandomNumber1() {
  var rnd = Math.random() * 99999999999;
     rnd += '';
     rnd = rnd.replace('.', '');
    return parseInt(rnd);
  };


 function generateRandomNumber2() {
  var rnd = Math.random() * 99999999999;
    return Math.floor(rnd);
  };