222221231213 has 4 divisors (see below), whose sum is σ = 222222456348. Its totient is φ = 222220006080.

The previous prime is 222221231209. The next prime is 222221231257. The reversal of 222221231213 is 312132122222.

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: 312132122222 = 2 ⋅156066061111.

It can be written as a sum of positive squares in 2 ways, for example, as 81477706249 + 140743524964 = 285443^2 + 375158^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221231213 - 2² = 222221231209 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 (222221236213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280478 + ... + 723263.

It is an arithmetic number, because the mean of its divisors is an integer number (55555614087).

Almost surely, 2^222221231213 is an apocalyptic number.

It is an amenable number.

222221231213 is a deficient number, since it is larger than the sum of its proper divisors (1225135).

222221231213 is a wasteful number, since it uses less digits than its factorization.

222221231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225134.

The product of its digits is 1152, while the sum is 23.

Adding to 222221231213 its reverse (312132122222), we get a palindrome (534353353435).

The spelling of 222221231213 in words is "two hundred twenty-two billion, two hundred twenty-one million, two hundred thirty-one thousand, two hundred thirteen".