121811123051 has 4 divisors (see below), whose sum is σ = 122928656400. Its totient is φ = 120693589704.

The previous prime is 121811123047. The next prime is 121811123099. The reversal of 121811123051 is 150321118121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121811123051 - 2² = 121811123047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121811123051.

It is not an unprimeable number, because it can be changed into a prime (121811128051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558766511 + ... + 558766728.

It is an arithmetic number, because the mean of its divisors is an integer number (30732164100).

Almost surely, 2^121811123051 is an apocalyptic number.

121811123051 is a deficient number, since it is larger than the sum of its proper divisors (1117533349).

121811123051 is a wasteful number, since it uses less digits than its factorization.

121811123051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117533348.

The product of its (nonzero) digits is 480, while the sum is 26.

The spelling of 121811123051 in words is "one hundred twenty-one billion, eight hundred eleven million, one hundred twenty-three thousand, fifty-one".