None. 1221 and 3443 are both 4-digit palindromes but no digit has remained the same between the two.
First and fourth, second and third.
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None. 1221 and 3443 are both 4-digit palindromes but no digit has remained the same between the two.
The first and last, and the second and third.
One. If you mean "digits", the number can have any amount of digits; the only requirement to be called a "palindrome" is that if you read it backwards, you get the same sequence of digits. Thus, any of the following is a palindrome: 1 (any 1-digit number is a palindrome), 55, 121, 2002, 12321, 600006, 8105018, ... As you can see, you can make them arbitrarily large.
There is no number palindrome for 563. A number palindrome is a number which is the same number when the digits are taken in the reverse order. For example, 2002 is the number palindrome of 2002 as it reads the same no matter which way it is read. Whereas 563 when read in reverse is "365" which is not the same as "563". Therefore ,there is no number palindrome for 563.
Is a number that reads the same whether you read the digits from left to right or from right to left.
It is number whose digits read the same from left to right and from right to left. For example, 18645254681.