18103211 has 4 divisors (see below), whose sum is σ = 20689392. Its totient is φ = 15517032.

The previous prime is 18103201. The next prime is 18103237. The reversal of 18103211 is 11230181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11230181 = 43 ⋅261167.

It is a cyclic number.

It is not a de Polignac number, because 18103211 - 2¹⁰ = 18102187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18103211.

It is not an unprimeable number, because it can be changed into a prime (18103201) 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 in 3 ways as a sum of consecutive naturals, for example, 1293080 + ... + 1293093.

It is an arithmetic number, because the mean of its divisors is an integer number (5172348).

Almost surely, 2^18103211 is an apocalyptic number.

18103211 is a deficient number, since it is larger than the sum of its proper divisors (2586181).

18103211 is an equidigital number, since it uses as much as digits as its factorization.

18103211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586180.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 18103211 is about 4254.7868336733. The cubic root of 18103211 is about 262.5740912549.

Adding to 18103211 its reverse (11230181), we get a palindrome (29333392).

The spelling of 18103211 in words is "eighteen million, one hundred three thousand, two hundred eleven".