18212002191 has 12 divisors (see below), whose sum is σ = 26453189880. Its totient is φ = 12073505040.

The previous prime is 18212002157. The next prime is 18212002213. The reversal of 18212002191 is 19120021281.

It is not a de Polignac number, because 18212002191 - 2¹¹ = 18212000143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18212002691) 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 11 ways as a sum of consecutive naturals, for example, 5650780 + ... + 5654001.

It is an arithmetic number, because the mean of its divisors is an integer number (2204432490).

Almost surely, 2^18212002191 is an apocalyptic number.

18212002191 is a deficient number, since it is larger than the sum of its proper divisors (8241187689).

18212002191 is a wasteful number, since it uses less digits than its factorization.

18212002191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11304966 (or 11304963 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The spelling of 18212002191 in words is "eighteen billion, two hundred twelve million, two thousand, one hundred ninety-one".