11112122111 has 4 divisors (see below), whose sum is σ = 11222143224. Its totient is φ = 11002101000.

The previous prime is 11112122101. The next prime is 11112122113. The reversal of 11112122111 is 11122121111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11122121111 = 101 ⋅110120011.

It is a cyclic number.

It is not a de Polignac number, because 11112122111 - 2²² = 11107927807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112122113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55010405 + ... + 55010606.

It is an arithmetic number, because the mean of its divisors is an integer number (2805535806).

Almost surely, 2^11112122111 is an apocalyptic number.

11112122111 is a deficient number, since it is larger than the sum of its proper divisors (110021113).

11112122111 is a wasteful number, since it uses less digits than its factorization.

11112122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110021112.

The product of its digits is 8, while the sum is 14.

Adding to 11112122111 its reverse (11122121111), we get a palindrome (22234243222).

The spelling of 11112122111 in words is "eleven billion, one hundred twelve million, one hundred twenty-two thousand, one hundred eleven".