18530865021 has 8 divisors (see below), whose sum is σ = 24902370304. Its totient is φ = 12256634880.

The previous prime is 18530865013. The next prime is 18530865047. The reversal of 18530865021 is 12056803581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18530865021 - 2³ = 18530865013 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 (18530865061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24318340 + ... + 24319101.

It is an arithmetic number, because the mean of its divisors is an integer number (3112796288).

Almost surely, 2^18530865021 is an apocalyptic number.

It is an amenable number.

18530865021 is a deficient number, since it is larger than the sum of its proper divisors (6371505283).

18530865021 is a wasteful number, since it uses less digits than its factorization.

18530865021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48637571.

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 18530865021 in words is "eighteen billion, five hundred thirty million, eight hundred sixty-five thousand, twenty-one".