1212209957867 has 2 divisors, whose sum is σ = 1212209957868. Its totient is φ = 1212209957866.

The previous prime is 1212209957839. The next prime is 1212209957873. The reversal of 1212209957867 is 7687599022121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7687599022121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212209957867 - 2⁸ = 1212209957611 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212209957897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606104978933 + 606104978934.

It is an arithmetic number, because the mean of its divisors is an integer number (606104978934).

Almost surely, 2^{1212209957867} is an apocalyptic number.

1212209957867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212209957867 is an equidigital number, since it uses as much as digits as its factorization.

1212209957867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 1212209957867 in words is "one trillion, two hundred twelve billion, two hundred nine million, nine hundred fifty-seven thousand, eight hundred sixty-seven".