Show me the number one in the world.
Don't talk to me of imaginary things that don't exist in the world.
More than one banana exists in the world. Talking about bananas is not a clear demonstration that the number 1 exists in the world. The number 1 is not a banana. The fact that you can't tell the difference is interesting.
There is a difference between "1 banana" and "banana". "One banana adds information that originally comes from outside of the mind.
"1 banana" or "12 banana" is a proposition about a specific set of bananas. That set is only in your mind. You might not be aware of this since the creation of objects and groups of objects is so basal.