18221404999 has 8 divisors (see below), whose sum is σ = 20829539360. Its totient is φ = 15614539776.

The previous prime is 18221404973. The next prime is 18221405003. The reversal of 18221404999 is 99940412281.

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 18221404999 - 2²⁷ = 18087187271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221404919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286314 + ... + 344119.

It is an arithmetic number, because the mean of its divisors is an integer number (2603692420).

Almost surely, 2^18221404999 is an apocalyptic number.

18221404999 is a deficient number, since it is larger than the sum of its proper divisors (2608134361).

18221404999 is an equidigital number, since it uses as much as digits as its factorization.

18221404999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634569.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 18221404999 in words is "eighteen billion, two hundred twenty-one million, four hundred four thousand, nine hundred ninety-nine".