121815538823 has 8 divisors (see below), whose sum is σ = 136130890896. Its totient is φ = 108040388800.

The previous prime is 121815538813. The next prime is 121815538843. The reversal of 121815538823 is 328835518121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121815538823 - 2⁴ = 121815538807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121815538813) 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 7 ways as a sum of consecutive naturals, for example, 135050036 + ... + 135050937.

It is an arithmetic number, because the mean of its divisors is an integer number (17016361362).

Almost surely, 2^121815538823 is an apocalyptic number.

121815538823 is a deficient number, since it is larger than the sum of its proper divisors (14315352073).

121815538823 is a wasteful number, since it uses less digits than its factorization.

121815538823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270101025.

The product of its digits is 460800, while the sum is 47.

The spelling of 121815538823 in words is "one hundred twenty-one billion, eight hundred fifteen million, five hundred thirty-eight thousand, eight hundred twenty-three".