18900222120191 has 2 divisors, whose sum is σ = 18900222120192. Its totient is φ = 18900222120190.

The previous prime is 18900222120173. The next prime is 18900222120301. The reversal of 18900222120191 is 19102122200981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18900222120191 - 2³⁰ = 18899148378367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18900222120391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9450111060095 + 9450111060096.

It is an arithmetic number, because the mean of its divisors is an integer number (9450111060096).

Almost surely, 2^{18900222120191} is an apocalyptic number.

18900222120191 is a deficient number, since it is larger than the sum of its proper divisors (1).

18900222120191 is an equidigital number, since it uses as much as digits as its factorization.

18900222120191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 18900222120191 in words is "eighteen trillion, nine hundred billion, two hundred twenty-two million, one hundred twenty thousand, one hundred ninety-one".