18845223321 has 32 divisors (see below), whose sum is σ = 26721031680. Its totient is φ = 11780640000.

The previous prime is 18845223317. The next prime is 18845223337. The reversal of 18845223321 is 12332254881.

It is not a de Polignac number, because 18845223321 - 2² = 18845223317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18845223321.

It is not an unprimeable number, because it can be changed into a prime (18845223311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2328001 + ... + 2336081.

It is an arithmetic number, because the mean of its divisors is an integer number (835032240).

Almost surely, 2^18845223321 is an apocalyptic number.

It is an amenable number.

18845223321 is a deficient number, since it is larger than the sum of its proper divisors (7875808359).

18845223321 is a wasteful number, since it uses less digits than its factorization.

18845223321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8517.

The product of its digits is 92160, while the sum is 39.

The spelling of 18845223321 in words is "eighteen billion, eight hundred forty-five million, two hundred twenty-three thousand, three hundred twenty-one".