11217321 has 6 divisors (see below), whose sum is σ = 16202810. Its totient is φ = 7478208.

The previous prime is 11217317. The next prime is 11217343. The reversal of 11217321 is 12371211.

It is a happy number.

11217321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6969600 + 4247721 = 2640^2 + 2061^2 .

It is not a de Polignac number, because 11217321 - 2² = 11217317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11217294 and 11217303.

It is not an unprimeable number, because it can be changed into a prime (11217301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 623176 + ... + 623193.

Almost surely, 2^11217321 is an apocalyptic number.

It is an amenable number.

11217321 is a deficient number, since it is larger than the sum of its proper divisors (4985489).

11217321 is a wasteful number, since it uses less digits than its factorization.

11217321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246375 (or 1246372 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 11217321 is about 3349.2269257248. The cubic root of 11217321 is about 223.8530671715.

Adding to 11217321 its reverse (12371211), we get a palindrome (23588532).

The spelling of 11217321 in words is "eleven million, two hundred seventeen thousand, three hundred twenty-one".