12321128 has 8 divisors (see below), whose sum is σ = 23102130. Its totient is φ = 6160560.

The previous prime is 12321121. The next prime is 12321131. The reversal of 12321128 is 82112321.

It can be written as a sum of positive squares in only one way, i.e., 10355524 + 1965604 = 3218^2 + 1402^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12321121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770063 + ... + 770078.

Almost surely, 2^12321128 is an apocalyptic number.

It is an amenable number.

12321128 is a deficient number, since it is larger than the sum of its proper divisors (10781002).

12321128 is a wasteful number, since it uses less digits than its factorization.

12321128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540147 (or 1540143 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 12321128 is about 3510.1464356918. The cubic root of 12321128 is about 230.9671186246.

Adding to 12321128 its reverse (82112321), we get a palindrome (94433449).

The spelling of 12321128 in words is "twelve million, three hundred twenty-one thousand, one hundred twenty-eight".