222121112222111 has 2 divisors, whose sum is σ = 222121112222112. Its totient is φ = 222121112222110.

The previous prime is 222121112222071. The next prime is 222121112222129. The reversal of 222121112222111 is 111222211121222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222121112222111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121112222171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060556111055 + 111060556111056.

It is an arithmetic number, because the mean of its divisors is an integer number (111060556111056).

Almost surely, 2^{222121112222111} is an apocalyptic number.

222121112222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121112222111 is an equidigital number, since it uses as much as digits as its factorization.

222121112222111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 23.

Adding to 222121112222111 its reverse (111222211121222), we get a palindrome (333343323343333).

The spelling of 222121112222111 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, one hundred eleven".