12105321 has 4 divisors (see below), whose sum is σ = 16140432. Its totient is φ = 8070212.

The previous prime is 12105319. The next prime is 12105341. The reversal of 12105321 is 12350121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12105321 - 2¹ = 12105319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12105321.

It is not an unprimeable number, because it can be changed into a prime (12105341) 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, 2017551 + ... + 2017556.

It is an arithmetic number, because the mean of its divisors is an integer number (4035108).

Almost surely, 2^12105321 is an apocalyptic number.

It is an amenable number.

12105321 is a deficient number, since it is larger than the sum of its proper divisors (4035111).

12105321 is an equidigital number, since it uses as much as digits as its factorization.

12105321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035110.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 12105321 is about 3479.2701820928. The cubic root of 12105321 is about 229.6106898611.

Adding to 12105321 its reverse (12350121), we get a palindrome (24455442).

The spelling of 12105321 in words is "twelve million, one hundred five thousand, three hundred twenty-one".