12321656 has 8 divisors (see below), whose sum is σ = 23103120. Its totient is φ = 6160824.

The previous prime is 12321653. The next prime is 12321679. The reversal of 12321656 is 65612321.

It is a tau number, because it is divible by the number of its divisors (8).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321653) 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, 770096 + ... + 770111.

It is an arithmetic number, because the mean of its divisors is an integer number (2887890).

Almost surely, 2^12321656 is an apocalyptic number.

It is an amenable number.

12321656 is a deficient number, since it is larger than the sum of its proper divisors (10781464).

12321656 is a wasteful number, since it uses less digits than its factorization.

12321656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540213 (or 1540209 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 12321656 is about 3510.2216454235. The cubic root of 12321656 is about 230.9704178056.

Adding to 12321656 its reverse (65612321), we get a palindrome (77933977).

It can be divided in two parts, 123216 and 56, that multiplied together give a palindrome (6900096).

The spelling of 12321656 in words is "twelve million, three hundred twenty-one thousand, six hundred fifty-six".