121111009979 has 2 divisors, whose sum is σ = 121111009980. Its totient is φ = 121111009978.

The previous prime is 121111009949. The next prime is 121111010021. The reversal of 121111009979 is 979900111121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121111009979 - 2¹⁶ = 121110944443 is a prime.

It is not a weakly prime, because it can be changed into another prime (121111009949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555504989 + 60555504990.

It is an arithmetic number, because the mean of its divisors is an integer number (60555504990).

Almost surely, 2^121111009979 is an apocalyptic number.

121111009979 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111009979 is an equidigital number, since it uses as much as digits as its factorization.

121111009979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 41.

The spelling of 121111009979 in words is "one hundred twenty-one billion, one hundred eleven million, nine thousand, nine hundred seventy-nine".