121220109979 has 2 divisors, whose sum is σ = 121220109980. Its totient is φ = 121220109978.

The previous prime is 121220109973. The next prime is 121220110031. The reversal of 121220109979 is 979901022121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220109979 - 2³ = 121220109971 is a prime.

It is not a weakly prime, because it can be changed into another prime (121220109971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610054989 + 60610054990.

It is an arithmetic number, because the mean of its divisors is an integer number (60610054990).

Almost surely, 2^121220109979 is an apocalyptic number.

121220109979 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220109979 is an equidigital number, since it uses as much as digits as its factorization.

121220109979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 121220109979 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred nine thousand, nine hundred seventy-nine".