22113221 has 4 divisors (see below), whose sum is σ = 23814252. Its totient is φ = 20412192.

The previous prime is 22113191. The next prime is 22113229. The reversal of 22113221 is 12231122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12231122 = 2 ⋅6115561.

It can be written as a sum of positive squares in 2 ways, for example, as 6225025 + 15888196 = 2495^2 + 3986^2 .

It is a cyclic number.

It is not a de Polignac number, because 22113221 - 2¹⁸ = 21851077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22113196 and 22113205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22113229) 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, 850496 + ... + 850521.

It is an arithmetic number, because the mean of its divisors is an integer number (5953563).

Almost surely, 2^22113221 is an apocalyptic number.

It is an amenable number.

22113221 is a deficient number, since it is larger than the sum of its proper divisors (1701031).

22113221 is a wasteful number, since it uses less digits than its factorization.

22113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701030.

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

The square root of 22113221 is about 4702.4696702903. The cubic root of 22113221 is about 280.6837921769.

Adding to 22113221 its reverse (12231122), we get a palindrome (34344343).

The spelling of 22113221 in words is "twenty-two million, one hundred thirteen thousand, two hundred twenty-one".