12211312 has 20 divisors (see below), whose sum is σ = 24211000. Its totient is φ = 5963328.

The previous prime is 12211307. The next prime is 12211327. The reversal of 12211312 is 21311221.

It is a super-2 number, since 2×12211312² = 298232281522688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12211292 and 12211301.

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 in 3 ways as a sum of consecutive naturals, for example, 8187 + ... + 9562.

It is an arithmetic number, because the mean of its divisors is an integer number (1210550).

Almost surely, 2^12211312 is an apocalyptic number.

It is an amenable number.

12211312 is a deficient number, since it is larger than the sum of its proper divisors (11999688).

12211312 is a wasteful number, since it uses less digits than its factorization.

12211312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17800 (or 17794 counting only the distinct ones).

The product of its digits is 24, while the sum is 13.

The square root of 12211312 is about 3494.4687722170. The cubic root of 12211312 is about 230.2788803659.

Adding to 12211312 its reverse (21311221), we get a palindrome (33522533).

Subtracting 12211312 from its reverse (21311221), we obtain a palindrome (9099909).

The spelling of 12211312 in words is "twelve million, two hundred eleven thousand, three hundred twelve".