1222211211 has 24 divisors (see below), whose sum is σ = 1770186816. Its totient is φ = 749754720.

The previous prime is 1222211203. The next prime is 1222211213. The reversal of 1222211211 is 1121122221.

It is not a de Polignac number, because 1222211211 - 2³ = 1222211203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222211213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164176 + ... + 171458.

It is an arithmetic number, because the mean of its divisors is an integer number (73757784).

Almost surely, 2^1222211211 is an apocalyptic number.

1222211211 is a deficient number, since it is larger than the sum of its proper divisors (547975605).

1222211211 is a wasteful number, since it uses less digits than its factorization.

1222211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7643 (or 7630 counting only the distinct ones).

The product of its digits is 32, while the sum is 15.

The square root of 1222211211 is about 34960.1374568236. The cubic root of 1222211211 is about 1069.1748991823.

Adding to 1222211211 its reverse (1121122221), we get a palindrome (2343333432).

The spelling of 1222211211 in words is "one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred eleven".