18211316 has 12 divisors (see below), whose sum is σ = 31907232. Its totient is φ = 9094968.

The previous prime is 18211313. The next prime is 18211321. The reversal of 18211316 is 61311281.

It is a junction number, because it is equal to n+sod(n) for n = 18211291 and 18211300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211313) 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, 2111 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (2658936).

Almost surely, 2^18211316 is an apocalyptic number.

It is an amenable number.

18211316 is a deficient number, since it is larger than the sum of its proper divisors (13695916).

18211316 is a wasteful number, since it uses less digits than its factorization.

18211316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350 (or 5348 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 18211316 is about 4267.4718511081. The cubic root of 18211316 is about 263.0957161476.

Adding to 18211316 its reverse (61311281), we get a palindrome (79522597).

The spelling of 18211316 in words is "eighteen million, two hundred eleven thousand, three hundred sixteen".