12105155 has 4 divisors (see below), whose sum is σ = 14526192. Its totient is φ = 9684120.

The previous prime is 12105143. The next prime is 12105167. The reversal of 12105155 is 55150121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55150121 = 13 ⋅4242317.

It is an interprime number because it is at equal distance from previous prime (12105143) and next prime (12105167).

It is not a de Polignac number, because 12105155 - 2¹⁴ = 12088771 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1210511 + ... + 1210520.

It is an arithmetic number, because the mean of its divisors is an integer number (3631548).

Almost surely, 2^12105155 is an apocalyptic number.

12105155 is a deficient number, since it is larger than the sum of its proper divisors (2421037).

12105155 is an equidigital number, since it uses as much as digits as its factorization.

12105155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421036.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 12105155 is about 3479.2463264334. The cubic root of 12105155 is about 229.6096403075.

Adding to 12105155 its reverse (55150121), we get a palindrome (67255276).

The spelling of 12105155 in words is "twelve million, one hundred five thousand, one hundred fifty-five".