18895016221 has 4 divisors (see below), whose sum is σ = 18897103744. Its totient is φ = 18892928700.

The previous prime is 18895016201. The next prime is 18895016251. The reversal of 18895016221 is 12261059881.

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 18895016221 - 2¹⁹ = 18894491933 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 (18895016201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1030125 + ... + 1048306.

It is an arithmetic number, because the mean of its divisors is an integer number (4724275936).

Almost surely, 2^18895016221 is an apocalyptic number.

It is an amenable number.

18895016221 is a deficient number, since it is larger than the sum of its proper divisors (2087523).

18895016221 is an equidigital number, since it uses as much as digits as its factorization.

18895016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087522.

The product of its (nonzero) digits is 69120, while the sum is 43.

The spelling of 18895016221 in words is "eighteen billion, eight hundred ninety-five million, sixteen thousand, two hundred twenty-one".