12123221212 has 12 divisors (see below), whose sum is σ = 21900012736. Its totient is φ = 5866074720.

The previous prime is 12123221167. The next prime is 12123221221. The reversal of 12123221212 is 21212232121.

It is a self number, because there is not a number n which added to its sum of digits gives 12123221212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48883833 + ... + 48884080.

Almost surely, 2^12123221212 is an apocalyptic number.

It is an amenable number.

12123221212 is a deficient number, since it is larger than the sum of its proper divisors (9776791524).

12123221212 is a wasteful number, since it uses less digits than its factorization.

12123221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97767948 (or 97767946 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

Adding to 12123221212 its reverse (21212232121), we get a palindrome (33335453333).

The spelling of 12123221212 in words is "twelve billion, one hundred twenty-three million, two hundred twenty-one thousand, two hundred twelve".