18212111 has 2 divisors, whose sum is σ = 18212112. Its totient is φ = 18212110.

The previous prime is 18212101. The next prime is 18212119. The reversal of 18212111 is 11121281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18212111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18212111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18212119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106055 + 9106056.

It is an arithmetic number, because the mean of its divisors is an integer number (9106056).

Almost surely, 2^18212111 is an apocalyptic number.

18212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

18212111 is an equidigital number, since it uses as much as digits as its factorization.

18212111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32, while the sum is 17.

The square root of 18212111 is about 4267.5649965759. The cubic root of 18212111 is about 263.0995445008.

Adding to 18212111 its reverse (11121281), we get a palindrome (29333392).

The spelling of 18212111 in words is "eighteen million, two hundred twelve thousand, one hundred eleven".