1821885223823 has 4 divisors (see below), whose sum is σ = 2082154541520. Its totient is φ = 1561615906128.

The previous prime is 1821885223819. The next prime is 1821885223841. The reversal of 1821885223823 is 3283225881281.

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 1821885223823 - 2² = 1821885223819 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 (1821885223853) 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, 130134658838 + ... + 130134658851.

It is an arithmetic number, because the mean of its divisors is an integer number (520538635380).

Almost surely, 2^{1821885223823} is an apocalyptic number.

1821885223823 is a deficient number, since it is larger than the sum of its proper divisors (260269317697).

1821885223823 is an equidigital number, since it uses as much as digits as its factorization.

1821885223823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260269317696.

The product of its digits is 2949120, while the sum is 53.

The spelling of 1821885223823 in words is "one trillion, eight hundred twenty-one billion, eight hundred eighty-five million, two hundred twenty-three thousand, eight hundred twenty-three".