121638574067 has 2 divisors, whose sum is σ = 121638574068. Its totient is φ = 121638574066.

The previous prime is 121638574051. The next prime is 121638574133. The reversal of 121638574067 is 760475836121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121638574067 - 2⁴ = 121638574051 is a prime.

It is not a weakly prime, because it can be changed into another prime (121638574867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60819287033 + 60819287034.

It is an arithmetic number, because the mean of its divisors is an integer number (60819287034).

Almost surely, 2^121638574067 is an apocalyptic number.

121638574067 is a deficient number, since it is larger than the sum of its proper divisors (1).

121638574067 is an equidigital number, since it uses as much as digits as its factorization.

121638574067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 121638574067 in words is "one hundred twenty-one billion, six hundred thirty-eight million, five hundred seventy-four thousand, sixty-seven".