12021997979 has 2 divisors, whose sum is σ = 12021997980. Its totient is φ = 12021997978.

The previous prime is 12021997973. The next prime is 12021998017. The reversal of 12021997979 is 97979912021.

It is a weak prime.

It is an emirp because it is prime and its reverse (97979912021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12021997979 - 2²⁰ = 12020949403 is a prime.

It is not a weakly prime, because it can be changed into another prime (12021997973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010998989 + 6010998990.

It is an arithmetic number, because the mean of its divisors is an integer number (6010998990).

Almost surely, 2^12021997979 is an apocalyptic number.

12021997979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021997979 is an equidigital number, since it uses as much as digits as its factorization.

12021997979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 56.

The spelling of 12021997979 in words is "twelve billion, twenty-one million, nine hundred ninety-seven thousand, nine hundred seventy-nine".