11216221 has 8 divisors (see below), whose sum is σ = 11531520. Its totient is φ = 10904208.

The previous prime is 11216201. The next prime is 11216239. The reversal of 11216221 is 12261211.

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 11216221 - 2⁵ = 11216189 is a prime.

It is a super-2 number, since 2×11216221² = 251607227041682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11216195 and 11216204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11216201) 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 7 ways as a sum of consecutive naturals, for example, 7135 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (1441440).

Almost surely, 2^11216221 is an apocalyptic number.

It is an amenable number.

11216221 is a deficient number, since it is larger than the sum of its proper divisors (315299).

11216221 is a wasteful number, since it uses less digits than its factorization.

11216221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its digits is 48, while the sum is 16.

The square root of 11216221 is about 3349.0627046981. The cubic root of 11216221 is about 223.8457497255.

Adding to 11216221 its reverse (12261211), we get a palindrome (23477432).

The spelling of 11216221 in words is "eleven million, two hundred sixteen thousand, two hundred twenty-one".