12105205 has 12 divisors (see below), whose sum is σ = 16898220. Its totient is φ = 8300544.

The previous prime is 12105193. The next prime is 12105211. The reversal of 12105205 is 50250121.

12105205 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4498641 + 7606564 = 2121^2 + 2758^2 .

It is not a de Polignac number, because 12105205 - 2⁷ = 12105077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24460 + ... + 24949.

It is an arithmetic number, because the mean of its divisors is an integer number (1408185).

Almost surely, 2^12105205 is an apocalyptic number.

It is an amenable number.

12105205 is a deficient number, since it is larger than the sum of its proper divisors (4793015).

12105205 is an equidigital number, since it uses as much as digits as its factorization.

12105205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49428 (or 49421 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 12105205 is about 3479.2535118902. The cubic root of 12105205 is about 229.6099564392.

Adding to 12105205 its reverse (50250121), we get a palindrome (62355326).

The spelling of 12105205 in words is "twelve million, one hundred five thousand, two hundred five".