121185618947 has 2 divisors, whose sum is σ = 121185618948. Its totient is φ = 121185618946.

The previous prime is 121185618941. The next prime is 121185618971. The reversal of 121185618947 is 749816581121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121185618947 - 2⁸ = 121185618691 is a prime.

It is not a weakly prime, because it can be changed into another prime (121185618941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60592809473 + 60592809474.

It is an arithmetic number, because the mean of its divisors is an integer number (60592809474).

Almost surely, 2^121185618947 is an apocalyptic number.

121185618947 is a deficient number, since it is larger than the sum of its proper divisors (1).

121185618947 is an equidigital number, since it uses as much as digits as its factorization.

121185618947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 53.

The spelling of 121185618947 in words is "one hundred twenty-one billion, one hundred eighty-five million, six hundred eighteen thousand, nine hundred forty-seven".