12368921 has 4 divisors (see below), whose sum is σ = 12670644. Its totient is φ = 12067200.

The previous prime is 12368903. The next prime is 12368927. The reversal of 12368921 is 12986321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12986321 = 1637 ⋅7933.

It can be written as a sum of positive squares in 2 ways, for example, as 2758921 + 9610000 = 1661^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 12368921 - 2⁶ = 12368857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12368927) 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 in 3 ways as a sum of consecutive naturals, for example, 150800 + ... + 150881.

It is an arithmetic number, because the mean of its divisors is an integer number (3167661).

Almost surely, 2^12368921 is an apocalyptic number.

It is an amenable number.

12368921 is a deficient number, since it is larger than the sum of its proper divisors (301723).

12368921 is an equidigital number, since it uses as much as digits as its factorization.

12368921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301722.

The product of its digits is 5184, while the sum is 32.

The square root of 12368921 is about 3516.9476822950. The cubic root of 12368921 is about 231.2653697113.

The spelling of 12368921 in words is "twelve million, three hundred sixty-eight thousand, nine hundred twenty-one".