12109321 has 12 divisors (see below), whose sum is σ = 14915988. Its totient is φ = 9768192.

The previous prime is 12109319. The next prime is 12109343. The reversal of 12109321 is 12390121.

It can be written as a sum of positive squares in 2 ways, for example, as 6175225 + 5934096 = 2485^2 + 2436^2 .

It is not a de Polignac number, because 12109321 - 2¹ = 12109319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12109381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6436 + ... + 8101.

It is an arithmetic number, because the mean of its divisors is an integer number (1242999).

Almost surely, 2^12109321 is an apocalyptic number.

It is an amenable number.

12109321 is a deficient number, since it is larger than the sum of its proper divisors (2806667).

12109321 is a wasteful number, since it uses less digits than its factorization.

12109321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14568 (or 14561 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 12109321 is about 3479.8449678111. The cubic root of 12109321 is about 229.6359774080.

Adding to 12109321 its reverse (12390121), we get a palindrome (24499442).

The spelling of 12109321 in words is "twelve million, one hundred nine thousand, three hundred twenty-one".