18836182221 has 4 divisors (see below), whose sum is σ = 25114909632. Its totient is φ = 12557454812.

The previous prime is 18836182201. The next prime is 18836182229. The reversal of 18836182221 is 12228163881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18836182221 - 2⁷ = 18836182093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18836182229) 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 3 ways as a sum of consecutive naturals, for example, 3139363701 + ... + 3139363706.

It is an arithmetic number, because the mean of its divisors is an integer number (6278727408).

Almost surely, 2^18836182221 is an apocalyptic number.

It is an amenable number.

18836182221 is a deficient number, since it is larger than the sum of its proper divisors (6278727411).

18836182221 is an equidigital number, since it uses as much as digits as its factorization.

18836182221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6278727410.

The product of its digits is 73728, while the sum is 42.

The spelling of 18836182221 in words is "eighteen billion, eight hundred thirty-six million, one hundred eighty-two thousand, two hundred twenty-one".