1111112222111 has 2 divisors, whose sum is σ = 1111112222112. Its totient is φ = 1111112222110.

The previous prime is 1111112222093. The next prime is 1111112222113. The reversal of 1111112222111 is 1112222111111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1111112222111 - 2¹⁸ = 1111111959967 is a prime.

Together with 1111112222113, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1111112222111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111112222113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555556111055 + 555556111056.

It is an arithmetic number, because the mean of its divisors is an integer number (555556111056).

Almost surely, 2^{1111112222111} is an apocalyptic number.

1111112222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111112222111 is an equidigital number, since it uses as much as digits as its factorization.

1111112222111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16, while the sum is 17.

Adding to 1111112222111 its reverse (1112222111111), we get a palindrome (2223334333222).

It can be divided in two parts, 111 and 1112222111, that multiplied together give a palindrome (123456654321).

The spelling of 1111112222111 in words is "one trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty-two thousand, one hundred eleven".