18123211 has 2 divisors, whose sum is σ = 18123212. Its totient is φ = 18123210.

The previous prime is 18123197. The next prime is 18123223. The reversal of 18123211 is 11232181.

It is a strong prime.

It is an emirp because it is prime and its reverse (11232181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18123211 - 2⁵ = 18123179 is a prime.

It is a pancake number, because a pancake can be divided into 18123211 parts by 6020 straight cuts.

It is not a weakly prime, because it can be changed into another prime (18120211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061605 + 9061606.

It is an arithmetic number, because the mean of its divisors is an integer number (9061606).

Almost surely, 2^18123211 is an apocalyptic number.

18123211 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123211 is an equidigital number, since it uses as much as digits as its factorization.

18123211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 19.

The square root of 18123211 is about 4257.1364789022. The cubic root of 18123211 is about 262.6707508863.

Adding to 18123211 its reverse (11232181), we get a palindrome (29355392).

The spelling of 18123211 in words is "eighteen million, one hundred twenty-three thousand, two hundred eleven".