1011111222111 has 16 divisors (see below), whose sum is σ = 1364446626816. Its totient is φ = 665925644736.

The previous prime is 1011111222101. The next prime is 1011111222113. The reversal of 1011111222111 is 1112221111101.

It is not a de Polignac number, because 1011111222111 - 2²¹ = 1011109124959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011111222113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7398051 + ... + 7533483.

It is an arithmetic number, because the mean of its divisors is an integer number (85277914176).

Almost surely, 2^{1011111222111} is an apocalyptic number.

1011111222111 is a deficient number, since it is larger than the sum of its proper divisors (353335404705).

1011111222111 is a wasteful number, since it uses less digits than its factorization.

1011111222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165502.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1011111222111 its reverse (1112221111101), we get a palindrome (2123332333212).

It can be divided in two parts, 101111 and 1222111, that multiplied together give a palindrome (123568865321).

The spelling of 1011111222111 in words is "one trillion, eleven billion, one hundred eleven million, two hundred twenty-two thousand, one hundred eleven".