12121142879 has 8 divisors (see below), whose sum is σ = 12778364928. Its totient is φ = 11480559480.

The previous prime is 12121142867. The next prime is 12121142903. The reversal of 12121142879 is 97824112121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121142879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121142809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4158167 + ... + 4161080.

It is an arithmetic number, because the mean of its divisors is an integer number (1597295616).

Almost surely, 2^12121142879 is an apocalyptic number.

12121142879 is a deficient number, since it is larger than the sum of its proper divisors (657222049).

12121142879 is an equidigital number, since it uses as much as digits as its factorization.

12121142879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8319325.

The product of its digits is 16128, while the sum is 38.

The spelling of 12121142879 in words is "twelve billion, one hundred twenty-one million, one hundred forty-two thousand, eight hundred seventy-nine".