6 of them.
Some 6 letter palindromes you may like:RedderHannah
6 if all digits are different, 27 otherwise.
987,654
6 digits
There are 900 6-digit palindromes.
6.
6 digits
6 of them.
6 of them. 4C2 = 4!/(2!*2!) = 4*3/(2*1) = 6
Some 6 letter palindromes you may like:RedderHannah
64 or 123
6 if all digits are different, 27 otherwise.
987,654
6 digits
6
It has 6 significant digits.