22222213 has 16 divisors (see below), whose sum is σ = 25519536. Its totient is φ = 19169280.

The previous prime is 22222199. The next prime is 22222223. The reversal of 22222213 is 31222222.

It can be written as a sum of positive squares in 8 ways, for example, as 1855044 + 20367169 = 1362^2 + 4513^2 .

It is not a de Polignac number, because 22222213 - 2¹⁷ = 22091141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222223) 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 15 ways as a sum of consecutive naturals, for example, 42393 + ... + 42913.

It is an arithmetic number, because the mean of its divisors is an integer number (1594971).

Almost surely, 2^22222213 is an apocalyptic number.

It is an amenable number.

22222213 is a deficient number, since it is larger than the sum of its proper divisors (3297323).

22222213 is a wasteful number, since it uses less digits than its factorization.

22222213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744.

The product of its digits is 192, while the sum is 16.

The square root of 22222213 is about 4714.0442297458. The cubic root of 22222213 is about 281.1441828756.

Adding to 22222213 its reverse (31222222), we get a palindrome (53444435).

Subtracting 22222213 from its reverse (31222222), we obtain a palindrome (9000009).

The spelling of 22222213 in words is "twenty-two million, two hundred twenty-two thousand, two hundred thirteen".