12111019979 has 4 divisors (see below), whose sum is σ = 12111272376. Its totient is φ = 12110767584.

The previous prime is 12111019967. The next prime is 12111019993. The reversal of 12111019979 is 97991011121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111019979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111010979) 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, 29549 + ... + 158414.

It is an arithmetic number, because the mean of its divisors is an integer number (3027818094).

Almost surely, 2^12111019979 is an apocalyptic number.

12111019979 is a deficient number, since it is larger than the sum of its proper divisors (252397).

12111019979 is an equidigital number, since it uses as much as digits as its factorization.

12111019979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252396.

The product of its (nonzero) digits is 10206, while the sum is 41.

The spelling of 12111019979 in words is "twelve billion, one hundred eleven million, nineteen thousand, nine hundred seventy-nine".