18012211 has 8 divisors (see below), whose sum is σ = 20653664. Its totient is φ = 15387840.

The previous prime is 18012199. The next prime is 18012217. The reversal of 18012211 is 11221081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18012211 - 2⁵ = 18012179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18012217) 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 in 7 ways as a sum of consecutive naturals, for example, 1920 + ... + 6301.

It is an arithmetic number, because the mean of its divisors is an integer number (2581708).

Almost surely, 2^18012211 is an apocalyptic number.

18012211 is a deficient number, since it is larger than the sum of its proper divisors (2641453).

18012211 is an equidigital number, since it uses as much as digits as its factorization.

18012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8541.

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

The square root of 18012211 is about 4244.0795232889. The cubic root of 18012211 is about 262.1333887530.

Adding to 18012211 its reverse (11221081), we get a palindrome (29233292).

The spelling of 18012211 in words is "eighteen million, twelve thousand, two hundred eleven".