12329921 has 4 divisors (see below), whose sum is σ = 12338052. Its totient is φ = 12321792.

The previous prime is 12329903. The next prime is 12329953. The reversal of 12329921 is 12992321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 3568321 = 2960^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 12329921 - 2⁶ = 12329857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12329021) 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 in 3 ways as a sum of consecutive naturals, for example, 1040 + ... + 5073.

It is an arithmetic number, because the mean of its divisors is an integer number (3084513).

Almost surely, 2^12329921 is an apocalyptic number.

It is an amenable number.

12329921 is a deficient number, since it is larger than the sum of its proper divisors (8131).

12329921 is an equidigital number, since it uses as much as digits as its factorization.

12329921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130.

The product of its digits is 1944, while the sum is 29.

The square root of 12329921 is about 3511.3987241554. The cubic root of 12329921 is about 231.0220489564.

The spelling of 12329921 in words is "twelve million, three hundred twenty-nine thousand, nine hundred twenty-one".