23821181781856 has 24 divisors (see below), whose sum is σ = 49656654671400. Its totient is φ = 11209967897088.

The previous prime is 23821181781833. The next prime is 23821181781857. The reversal of 23821181781856 is 65818718112832.

It is a junction number, because it is equal to n+sod(n) for n = 23821181781794 and 23821181781803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23821181781857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21894468006 + ... + 21894469093.

It is an arithmetic number, because the mean of its divisors is an integer number (2069027277975).

Almost surely, 2^{23821181781856} is an apocalyptic number.

It is an amenable number.

23821181781856 is an abundant number, since it is smaller than the sum of its proper divisors (25835472889544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23821181781856 is a wasteful number, since it uses less digits than its factorization.

23821181781856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43788937126 (or 43788937118 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 61.

The spelling of 23821181781856 in words is "twenty-three trillion, eight hundred twenty-one billion, one hundred eighty-one million, seven hundred eighty-one thousand, eight hundred fifty-six".