12849372121 has 4 divisors (see below), whose sum is σ = 12854146212. Its totient is φ = 12844598032.

The previous prime is 12849372077. The next prime is 12849372127. The reversal of 12849372121 is 12127394821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12127394821 = 157 ⋅77244553.

It can be written as a sum of positive squares in 2 ways, for example, as 1810928025 + 11038444096 = 42555^2 + 105064^2 .

It is a cyclic number.

It is not a de Polignac number, because 12849372121 - 2¹¹ = 12849370073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12849372127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2383006 + ... + 2388391.

It is an arithmetic number, because the mean of its divisors is an integer number (3213536553).

Almost surely, 2^12849372121 is an apocalyptic number.

It is an amenable number.

12849372121 is a deficient number, since it is larger than the sum of its proper divisors (4774091).

12849372121 is an equidigital number, since it uses as much as digits as its factorization.

12849372121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4774090.

The product of its digits is 48384, while the sum is 40.

The spelling of 12849372121 in words is "twelve billion, eight hundred forty-nine million, three hundred seventy-two thousand, one hundred twenty-one".