1111222121111 has 16 divisors (see below), whose sum is σ = 1122980628000. Its totient is φ = 1099520621568.

The previous prime is 1111222121089. The next prime is 1111222121167. The reversal of 1111222121111 is 1111212221111.

It is a cyclic number.

It is not a de Polignac number, because 1111222121111 - 2³⁴ = 1094042251927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111222121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111222121171) 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, 126948911 + ... + 126957663.

It is an arithmetic number, because the mean of its divisors is an integer number (70186289250).

Almost surely, 2^{1111222121111} is an apocalyptic number.

1111222121111 is a deficient number, since it is larger than the sum of its proper divisors (11758506889).

1111222121111 is a wasteful number, since it uses less digits than its factorization.

1111222121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11858.

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

Adding to 1111222121111 its reverse (1111212221111), we get a palindrome (2222434342222).

The spelling of 1111222121111 in words is "one trillion, one hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".