18470817221 has 8 divisors (see below), whose sum is σ = 18536804640. Its totient is φ = 18404940112.

The previous prime is 18470817179. The next prime is 18470817247. The reversal of 18470817221 is 12271807481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18470817221 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 (18470847221) 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, 315470 + ... + 369408.

It is an arithmetic number, because the mean of its divisors is an integer number (2317100580).

Almost surely, 2^18470817221 is an apocalyptic number.

It is an amenable number.

18470817221 is a deficient number, since it is larger than the sum of its proper divisors (65987419).

18470817221 is an equidigital number, since it uses as much as digits as its factorization.

18470817221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55155.

The product of its (nonzero) digits is 50176, while the sum is 41.

The spelling of 18470817221 in words is "eighteen billion, four hundred seventy million, eight hundred seventeen thousand, two hundred twenty-one".