121256074347899 has 16 divisors (see below), whose sum is σ = 127208808771840. Its totient is φ = 115421562900000.

The previous prime is 121256074347893. The next prime is 121256074347901. The reversal of 121256074347899 is 998743470652121.

It is a cyclic number.

It is not a de Polignac number, because 121256074347899 - 2²⁸ = 121255805912443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121256074347893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54525524 + ... + 56705774.

It is an arithmetic number, because the mean of its divisors is an integer number (7950550548240).

It is a 1-persistent number, because it is pandigital, but 2⋅121256074347899 = 242512148695798 is not.

Almost surely, 2^{121256074347899} is an apocalyptic number.

121256074347899 is a deficient number, since it is larger than the sum of its proper divisors (5952734423941).

121256074347899 is a wasteful number, since it uses less digits than its factorization.

121256074347899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207362.

The product of its (nonzero) digits is 182891520, while the sum is 68.

The spelling of 121256074347899 in words is "one hundred twenty-one trillion, two hundred fifty-six billion, seventy-four million, three hundred forty-seven thousand, eight hundred ninety-nine".