1216222223 has 4 divisors (see below), whose sum is σ = 1216403760. Its totient is φ = 1216040688.

The previous prime is 1216222199. The next prime is 1216222229. The reversal of 1216222223 is 3222226121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216222223 - 2⁶ = 1216222159 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 (1216222229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80318 + ... + 94251.

It is an arithmetic number, because the mean of its divisors is an integer number (304100940).

Almost surely, 2^1216222223 is an apocalyptic number.

1216222223 is a deficient number, since it is larger than the sum of its proper divisors (181537).

1216222223 is an equidigital number, since it uses as much as digits as its factorization.

1216222223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181536.

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

The square root of 1216222223 is about 34874.3777435526. The cubic root of 1216222223 is about 1067.4256752893.

Adding to 1216222223 its reverse (3222226121), we get a palindrome (4438448344).

The spelling of 1216222223 in words is "one billion, two hundred sixteen million, two hundred twenty-two thousand, two hundred twenty-three".