121199018929 has 2 divisors, whose sum is σ = 121199018930. Its totient is φ = 121199018928.

The previous prime is 121199018923. The next prime is 121199018933. The reversal of 121199018929 is 929810991121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120197423025 + 1001595904 = 346695^2 + 31648^2 .

It is an emirp because it is prime and its reverse (929810991121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121199018929 - 2³ = 121199018921 is a prime.

It is not a weakly prime, because it can be changed into another prime (121199018921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60599509464 + 60599509465.

It is an arithmetic number, because the mean of its divisors is an integer number (60599509465).

Almost surely, 2^121199018929 is an apocalyptic number.

It is an amenable number.

121199018929 is a deficient number, since it is larger than the sum of its proper divisors (1).

121199018929 is an equidigital number, since it uses as much as digits as its factorization.

121199018929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 52.

The spelling of 121199018929 in words is "one hundred twenty-one billion, one hundred ninety-nine million, eighteen thousand, nine hundred twenty-nine".