121209446947 has 2 divisors, whose sum is σ = 121209446948. Its totient is φ = 121209446946.

The previous prime is 121209446933. The next prime is 121209447031. The reversal of 121209446947 is 749644902121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121209446947 - 2⁷ = 121209446819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121209446947.

It is not a weakly prime, because it can be changed into another prime (121209446927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60604723473 + 60604723474.

It is an arithmetic number, because the mean of its divisors is an integer number (60604723474).

Almost surely, 2^121209446947 is an apocalyptic number.

121209446947 is a deficient number, since it is larger than the sum of its proper divisors (1).

121209446947 is an equidigital number, since it uses as much as digits as its factorization.

121209446947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 121209446947 in words is "one hundred twenty-one billion, two hundred nine million, four hundred forty-six thousand, nine hundred forty-seven".