1222518211 has 2 divisors, whose sum is σ = 1222518212. Its totient is φ = 1222518210.

The previous prime is 1222518203. The next prime is 1222518239. The reversal of 1222518211 is 1128152221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1222518211 - 2³ = 1222518203 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222518911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611259105 + 611259106.

It is an arithmetic number, because the mean of its divisors is an integer number (611259106).

Almost surely, 2^1222518211 is an apocalyptic number.

1222518211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222518211 is an equidigital number, since it uses as much as digits as its factorization.

1222518211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 25.

The square root of 1222518211 is about 34964.5278961407. The cubic root of 1222518211 is about 1069.2644115929.

The spelling of 1222518211 in words is "one billion, two hundred twenty-two million, five hundred eighteen thousand, two hundred eleven".