12321212 has 6 divisors (see below), whose sum is σ = 21562128. Its totient is φ = 6160604.

The previous prime is 12321193. The next prime is 12321223. The reversal of 12321212 is 21212321.

It is a happy number.

12321212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a super-3 number, since 3×12321212³ (a number of 22 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1540148 + ... + 1540155.

It is an arithmetic number, because the mean of its divisors is an integer number (3593688).

Almost surely, 2^12321212 is an apocalyptic number.

It is an amenable number.

12321212 is a deficient number, since it is larger than the sum of its proper divisors (9240916).

12321212 is a wasteful number, since it uses less digits than its factorization.

12321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080307 (or 3080305 counting only the distinct ones).

The product of its digits is 48, while the sum is 14.

The square root of 12321212 is about 3510.1584009842. The cubic root of 12321212 is about 230.9676435006.

Adding to 12321212 its reverse (21212321), we get a palindrome (33533533).

The spelling of 12321212 in words is "twelve million, three hundred twenty-one thousand, two hundred twelve".