11223221 has 4 divisors (see below), whose sum is σ = 11334444. Its totient is φ = 11112000.

The previous prime is 11223181. The next prime is 11223253. The reversal of 11223221 is 12232211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8940100 + 2283121 = 2990^2 + 1511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11223221 is a prime.

It is a super-2 number, since 2×11223221² = 251921379229682, 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 = 11223196 and 11223205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11223521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55460 + ... + 55661.

It is an arithmetic number, because the mean of its divisors is an integer number (2833611).

Almost surely, 2^11223221 is an apocalyptic number.

It is an amenable number.

11223221 is a deficient number, since it is larger than the sum of its proper divisors (111223).

11223221 is a wasteful number, since it uses less digits than its factorization.

11223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111222.

The product of its digits is 48, while the sum is 14.

The square root of 11223221 is about 3350.1076102119. The cubic root of 11223221 is about 223.8923071293.

Adding to 11223221 its reverse (12232211), we get a palindrome (23455432).

The spelling of 11223221 in words is "eleven million, two hundred twenty-three thousand, two hundred twenty-one".