12175857121 has 4 divisors (see below), whose sum is σ = 12246237972. Its totient is φ = 12105476272.

The previous prime is 12175857119. The next prime is 12175857131.

12175857121 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11462700096 + 713157025 = 107064^2 + 26705^2 .

It is a cyclic number.

It is not a de Polignac number, because 12175857121 - 2¹ = 12175857119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12175857101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35190166 + ... + 35190511.

It is an arithmetic number, because the mean of its divisors is an integer number (3061559493).

Almost surely, 2^12175857121 is an apocalyptic number.

It is an amenable number.

12175857121 is a deficient number, since it is larger than the sum of its proper divisors (70380851).

12175857121 is an equidigital number, since it uses as much as digits as its factorization.

12175857121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70380850.

The product of its digits is 39200, while the sum is 40.

The spelling of 12175857121 in words is "twelve billion, one hundred seventy-five million, eight hundred fifty-seven thousand, one hundred twenty-one".