12321905 has 16 divisors (see below), whose sum is σ = 15586560. Its totient is φ = 9332928.

The previous prime is 12321901. The next prime is 12321919. The reversal of 12321905 is 50912321.

12321905 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12321905 - 2² = 12321901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (12321901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12044 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (974160).

Almost surely, 2^12321905 is an apocalyptic number.

It is an amenable number.

12321905 is a deficient number, since it is larger than the sum of its proper divisors (3264655).

12321905 is a wasteful number, since it uses less digits than its factorization.

12321905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 12321905 is about 3510.2571130902. The cubic root of 12321905 is about 230.9719736367.

The spelling of 12321905 in words is "twelve million, three hundred twenty-one thousand, nine hundred five".