18480220821 has 16 divisors (see below), whose sum is σ = 28988582400. Its totient is φ = 11595432384.

The previous prime is 18480220817. The next prime is 18480220879. The reversal of 18480220821 is 12802208481.

It is not a de Polignac number, because 18480220821 - 2² = 18480220817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18480220921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20130501 + ... + 20131418.

It is an arithmetic number, because the mean of its divisors is an integer number (1811786400).

Almost surely, 2^18480220821 is an apocalyptic number.

It is an amenable number.

18480220821 is a deficient number, since it is larger than the sum of its proper divisors (10508361579).

18480220821 is a wasteful number, since it uses less digits than its factorization.

18480220821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40261945 (or 40261939 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The spelling of 18480220821 in words is "eighteen billion, four hundred eighty million, two hundred twenty thousand, eight hundred twenty-one".