121823871823 has 4 divisors (see below), whose sum is σ = 122137044120. Its totient is φ = 121510699528.

The previous prime is 121823871797. The next prime is 121823871839. The reversal of 121823871823 is 328178328121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328178328121 = 7 ⋅46882618303.

It is a cyclic number.

It is not a de Polignac number, because 121823871823 - 2⁵ = 121823871791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121823871893) 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, 156585565 + ... + 156586342.

It is an arithmetic number, because the mean of its divisors is an integer number (30534261030).

Almost surely, 2^121823871823 is an apocalyptic number.

121823871823 is a deficient number, since it is larger than the sum of its proper divisors (313172297).

121823871823 is an equidigital number, since it uses as much as digits as its factorization.

121823871823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313172296.

The product of its digits is 258048, while the sum is 46.

The spelling of 121823871823 in words is "one hundred twenty-one billion, eight hundred twenty-three million, eight hundred seventy-one thousand, eight hundred twenty-three".