1222222111211 has 2 divisors, whose sum is σ = 1222222111212. Its totient is φ = 1222222111210.

The previous prime is 1222222111199. The next prime is 1222222111291. The reversal of 1222222111211 is 1121112222221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1222222111211 - 2¹⁸ = 1222221849067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222222111291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611111055605 + 611111055606.

It is an arithmetic number, because the mean of its divisors is an integer number (611111055606).

Almost surely, 2^{1222222111211} is an apocalyptic number.

1222222111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222222111211 is an equidigital number, since it uses as much as digits as its factorization.

1222222111211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 20.

Adding to 1222222111211 its reverse (1121112222221), we get a palindrome (2343334333432).

The spelling of 1222222111211 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred eleven thousand, two hundred eleven".