12103 is nontrivially palindromic in base 12.
It is an alternating number because its digits alternate between odd and even.
12103 is a lucky number.
It is a plaindrome in base 15.
It is a congruent number.
12103 is a Friedman number, since it can be written as 110^2+3, using all its digits and the basic arithmetic operations.
212103 is an apocalyptic number.
12103 is a gapful number since it is divisible by the number (13) formed by its first and last digit.
12103 is a wasteful number, since it uses less digits than its factorization.
12103 is an odious number, because the sum of its binary digits is odd.
The square root of 12103 is about 110.0136355185. The cubic root of 12103 is about 22.9596014208.
Adding to 12103 its reverse (30121), we get a palindrome (42224).
The spelling of 12103 in words is "twelve thousand, one hundred three", and thus it is an iban number.