22213221 has 8 divisors (see below), whose sum is σ = 29640384. Its totient is φ = 14797440.

The previous prime is 22213183. The next prime is 22213259. The reversal of 22213221 is 12231222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22213183) and next prime (22213259).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22213221 - 2¹⁵ = 22180453 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22213621) 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, 4216 + ... + 7886.

It is an arithmetic number, because the mean of its divisors is an integer number (3705048).

Almost surely, 2^22213221 is an apocalyptic number.

It is an amenable number.

22213221 is a deficient number, since it is larger than the sum of its proper divisors (7427163).

22213221 is a wasteful number, since it uses less digits than its factorization.

22213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691.

The product of its digits is 96, while the sum is 15.

The square root of 22213221 is about 4713.0903874210. The cubic root of 22213221 is about 281.1062570166.

Adding to 22213221 its reverse (12231222), we get a palindrome (34444443).

The spelling of 22213221 in words is "twenty-two million, two hundred thirteen thousand, two hundred twenty-one".