18212011 has 2 divisors, whose sum is σ = 18212012. Its totient is φ = 18212010.

The previous prime is 18212009. The next prime is 18212023. The reversal of 18212011 is 11021281.

It is a weak prime.

It is an emirp because it is prime and its reverse (11021281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18212011 - 2¹ = 18212009 is a prime.

Together with 18212009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18212071) 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, 9106005 + 9106006.

It is an arithmetic number, because the mean of its divisors is an integer number (9106006).

Almost surely, 2^18212011 is an apocalyptic number.

18212011 is a deficient number, since it is larger than the sum of its proper divisors (1).

18212011 is an equidigital number, since it uses as much as digits as its factorization.

18212011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 18212011 is about 4267.5532802767. The cubic root of 18212011 is about 263.0990629531.

Adding to 18212011 its reverse (11021281), we get a palindrome (29233292).

The spelling of 18212011 in words is "eighteen million, two hundred twelve thousand, eleven".