123121686875 has 20 divisors (see below), whose sum is σ = 167839492920. Its totient is φ = 89543040000.

The previous prime is 123121686871. The next prime is 123121686901. The reversal of 123121686875 is 578686121321.

It is not a de Polignac number, because 123121686875 - 2² = 123121686871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123121686871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8947430 + ... + 8961179.

It is an arithmetic number, because the mean of its divisors is an integer number (8391974646).

Almost surely, 2^123121686875 is an apocalyptic number.

123121686875 is a deficient number, since it is larger than the sum of its proper divisors (44717806045).

123121686875 is an equidigital number, since it uses as much as digits as its factorization.

123121686875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17908640 (or 17908625 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The spelling of 123121686875 in words is "one hundred twenty-three billion, one hundred twenty-one million, six hundred eighty-six thousand, eight hundred seventy-five".