When we bestow existence upon a number it is not that the number is external to us and we internalize it or that it is internal and we merely externalize it. It is both external and internal. By bestowing existence upon it, we merely recognize it. By realizing something and acknowledging it - we do not change its nature. This is why meaning has nothing to do with existence, bestowed or not.
Meaning is a human category.
It is the name we give to the cognitive experience of shifting frames of reference. It has nothing to do with entities, only with us. The world has no internal and external to it. Only we do. And when we bestow existence upon a number we only acknowledge its existence.