Since palindrome denotes a word that reads the same forwards as backwards, a one-digit palindrome would not make sense.
5335
Any number that is is a palindrome will always be a palindrome.
-1
A palindrome reads the same forward and in reverse. This tells me that at leastthe first digit and the last digit must be the same. So it's not possible to have a6-digit palindrome "with no same digits".The largest 6-digit palindrome, with just enough repetition of digits to make it apalindrome and no more, would be 987,789 .
101
1, 2, 3
999
No.
101
Eleven
999999
9999