1222222211 has 8 divisors (see below), whose sum is σ = 1397243904. Its totient is φ = 1047305160.

The previous prime is 1222222189. The next prime is 1222222223. The reversal of 1222222211 is 1122222221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1222222211 - 2²⁶ = 1155113347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222222211.

It is not an unprimeable number, because it can be changed into a prime (1222222511) 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, 716 + ... + 49446.

It is an arithmetic number, because the mean of its divisors is an integer number (174655488).

Almost surely, 2^1222222211 is an apocalyptic number.

1222222211 is a deficient number, since it is larger than the sum of its proper divisors (175021693).

1222222211 is an equidigital number, since it uses as much as digits as its factorization.

1222222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52321.

The product of its digits is 128, while the sum is 17.

The square root of 1222222211 is about 34960.2947785055. The cubic root of 1222222211 is about 1069.1781067263.

Adding to 1222222211 its reverse (1122222221), we get a palindrome (2344444432).

The spelling of 1222222211 in words is "one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred eleven".