12121120221979 has 2 divisors, whose sum is σ = 12121120221980. Its totient is φ = 12121120221978.

The previous prime is 12121120221961. The next prime is 12121120222109. The reversal of 12121120221979 is 97912202112121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121120221979 is a prime.

It is not a weakly prime, because it can be changed into another prime (12121120221079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060560110989 + 6060560110990.

It is an arithmetic number, because the mean of its divisors is an integer number (6060560110990).

Almost surely, 2^{12121120221979} is an apocalyptic number.

12121120221979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121120221979 is an equidigital number, since it uses as much as digits as its factorization.

12121120221979 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 12121120221979 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, nine hundred seventy-nine".