There are not just 13 non-palindromic numbers. Most numbers are non-palindromic.
There are 90 palindromic numbers between 100 and 1000
No.
Nobody went out to create them: some numbers simply happen to be palindromic and others don't.
No.
777717711771817718817...
infinite
there are 10 palindromic numbers between 9000 and 10000 9009,9119,9229,9339,9449,9559,9669,9779,9889,9999!!!
As 20569.8 is not palindromic, any number that is like it must contain that property and similarly be non-palindromic, so no.
Oh, what a happy little question! There are 90 three-digit palindromic numbers in total. You see, they start at 101 and end at 999, with each one bringing its own unique charm and symmetry to the canvas of mathematics. Just imagine the joy of exploring all these lovely palindromic numbers!
I guess that the smallest would be zero, if you don't consider negative numbers. There is no largest palindromic number - you can make them as large as you like.
1097