18584040221 has 8 divisors (see below), whose sum is σ = 18618153600. Its totient is φ = 18549959040.

The previous prime is 18584040203. The next prime is 18584040259. The reversal of 18584040221 is 12204048581.

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

It is a cyclic number.

It is not a de Polignac number, because 18584040221 - 2³⁴ = 1404171037 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 (18584040281) 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 7 ways as a sum of consecutive naturals, for example, 1348556 + ... + 1362266.

It is an arithmetic number, because the mean of its divisors is an integer number (2327269200).

Almost surely, 2^18584040221 is an apocalyptic number.

It is an amenable number.

18584040221 is a deficient number, since it is larger than the sum of its proper divisors (34113379).

18584040221 is a wasteful number, since it uses less digits than its factorization.

18584040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16099.

The product of its (nonzero) digits is 20480, while the sum is 35.

The spelling of 18584040221 in words is "eighteen billion, five hundred eighty-four million, forty thousand, two hundred twenty-one".