122222221111 has 2 divisors, whose sum is σ = 122222221112. Its totient is φ = 122222221110.

The previous prime is 122222221091. The next prime is 122222221127. The reversal of 122222221111 is 111122222221.

It is a strong prime.

It is an emirp because it is prime and its reverse (111122222221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122222221111 - 2¹⁵ = 122222188343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122222221151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61111110555 + 61111110556.

It is an arithmetic number, because the mean of its divisors is an integer number (61111110556).

Almost surely, 2^122222221111 is an apocalyptic number.

122222221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

122222221111 is an equidigital number, since it uses as much as digits as its factorization.

122222221111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 19.

Adding to 122222221111 its reverse (111122222221), we get a palindrome (233344443332).

It can be divided in two parts, 122222221 and 111, that multiplied together give a palindrome (13566666531).

The spelling of 122222221111 in words is "one hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".