12122121021979 has 2 divisors, whose sum is σ = 12122121021980. Its totient is φ = 12122121021978.

The previous prime is 12122121021949. The next prime is 12122121022027. The reversal of 12122121021979 is 97912012122121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12122121021979 - 2⁵ = 12122121021947 is a prime.

It is not a weakly prime, because it can be changed into another prime (12122121021949) 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 as a sum of consecutive naturals, namely, 6061060510989 + 6061060510990.

It is an arithmetic number, because the mean of its divisors is an integer number (6061060510990).

Almost surely, 2^{12122121021979} is an apocalyptic number.

12122121021979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122121021979 is an equidigital number, since it uses as much as digits as its factorization.

12122121021979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 12122121021979 in words is "twelve trillion, one hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, nine hundred seventy-nine".