18900222120211 has 4 divisors (see below), whose sum is σ = 18900322031800. Its totient is φ = 18900122208624.

The previous prime is 18900222120191. The next prime is 18900222120301. The reversal of 18900222120211 is 11202122200981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18900222120211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18900222120811) 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, 49671501 + ... + 50050558.

It is an arithmetic number, because the mean of its divisors is an integer number (4725080507950).

Almost surely, 2^{18900222120211} is an apocalyptic number.

18900222120211 is a deficient number, since it is larger than the sum of its proper divisors (99911589).

18900222120211 is an equidigital number, since it uses as much as digits as its factorization.

18900222120211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99911588.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 18900222120211 in words is "eighteen trillion, nine hundred billion, two hundred twenty-two million, one hundred twenty thousand, two hundred eleven".