It is a happy number.
1212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (12).
It is an alternating number because its digits alternate between odd and even.
1212 is an undulating number in base 10.
It is a plaindrome in base 15 and base 16.
It is a nialpdrome in base 12.
It is a self number, because there is not a number n which added to its sum of digits gives 1212.
It is a congruent number.
1212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
21212 is an apocalyptic number.
1212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1212 is a wasteful number, since it uses less digits than its factorization.
1212 is an evil number, because the sum of its binary digits is even.
The square root of 1212 is about 34.8137903711. The cubic root of 1212 is about 10.6618902226.
Adding to 1212 its reverse (2121), we get a palindrome (3333).
Subtracting 1212 from its reverse (2121), we obtain a palindrome (909).
The spelling of 1212 in words is "one thousand, two hundred twelve", and thus it is an iban number.