12217312 has 12 divisors (see below), whose sum is σ = 24052896. Its totient is φ = 6108640.

The previous prime is 12217277. The next prime is 12217313. The reversal of 12217312 is 21371221.

It is a self number, because there is not a number n which added to its sum of digits gives 12217312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12217313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190864 + ... + 190927.

It is an arithmetic number, because the mean of its divisors is an integer number (2004408).

Almost surely, 2^12217312 is an apocalyptic number.

It is an amenable number.

12217312 is a deficient number, since it is larger than the sum of its proper divisors (11835584).

12217312 is an equidigital number, since it uses as much as digits as its factorization.

12217312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381801 (or 381793 counting only the distinct ones).

The product of its digits is 168, while the sum is 19.

The square root of 12217312 is about 3495.3271663751. The cubic root of 12217312 is about 230.3165898561.

Adding to 12217312 its reverse (21371221), we get a palindrome (33588533).

The spelling of 12217312 in words is "twelve million, two hundred seventeen thousand, three hundred twelve".