12219587979 has 4 divisors (see below), whose sum is σ = 16292783976. Its totient is φ = 8146391984.

The previous prime is 12219587977. The next prime is 12219587993. The reversal of 12219587979 is 97978591221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12219587979 - 2¹ = 12219587977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12219587977) 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, 2036597994 + ... + 2036597999.

It is an arithmetic number, because the mean of its divisors is an integer number (4073195994).

Almost surely, 2^12219587979 is an apocalyptic number.

12219587979 is a deficient number, since it is larger than the sum of its proper divisors (4073195997).

12219587979 is an equidigital number, since it uses as much as digits as its factorization.

12219587979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073195996.

The product of its digits is 5715360, while the sum is 60.

The spelling of 12219587979 in words is "twelve billion, two hundred nineteen million, five hundred eighty-seven thousand, nine hundred seventy-nine".