12321916 has 6 divisors (see below), whose sum is σ = 21563360. Its totient is φ = 6160956.

The previous prime is 12321901. The next prime is 12321919. The reversal of 12321916 is 61912321.

It is a super-2 number, since 2×12321916² = 303659227822112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321919) by changing a digit.

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, 1540236 + ... + 1540243.

Almost surely, 2^12321916 is an apocalyptic number.

It is an amenable number.

12321916 is a deficient number, since it is larger than the sum of its proper divisors (9241444).

12321916 is a wasteful number, since it uses less digits than its factorization.

12321916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080483 (or 3080481 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

The square root of 12321916 is about 3510.2586799266. The cubic root of 12321916 is about 230.9720423677.

The spelling of 12321916 in words is "twelve million, three hundred twenty-one thousand, nine hundred sixteen".