11218321 has 4 divisors (see below), whose sum is σ = 11225200. Its totient is φ = 11211444.

The previous prime is 11218267. The next prime is 11218343. The reversal of 11218321 is 12381211.

11218321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12381211 = 1307 ⋅9473.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11218321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11218381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550 + ... + 4768.

It is an arithmetic number, because the mean of its divisors is an integer number (2806300).

Almost surely, 2^11218321 is an apocalyptic number.

It is an amenable number.

11218321 is a deficient number, since it is larger than the sum of its proper divisors (6879).

11218321 is an equidigital number, since it uses as much as digits as its factorization.

11218321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878.

The product of its digits is 96, while the sum is 19.

The square root of 11218321 is about 3349.3762105801. The cubic root of 11218321 is about 223.8597189801.

Adding to 11218321 its reverse (12381211), we get a palindrome (23599532).

The spelling of 11218321 in words is "eleven million, two hundred eighteen thousand, three hundred twenty-one".