111100211111 has 4 divisors (see below), whose sum is σ = 111101375400. Its totient is φ = 111099046824.

The previous prime is 111100211099. The next prime is 111100211171. The reversal of 111100211111 is 111112001111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111112001111 = 73 ⋅1522082207.

It is a cyclic number.

It is not a de Polignac number, because 111100211111 - 2²⁶ = 111033102247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111100211092 and 111100211101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100211171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424841 + ... + 634578.

It is an arithmetic number, because the mean of its divisors is an integer number (27775343850).

Almost surely, 2^111100211111 is an apocalyptic number.

111100211111 is a deficient number, since it is larger than the sum of its proper divisors (1164289).

111100211111 is a wasteful number, since it uses less digits than its factorization.

111100211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164288.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 111100211111 its reverse (111112001111), we get a palindrome (222212212222).

The spelling of 111100211111 in words is "one hundred eleven billion, one hundred million, two hundred eleven thousand, one hundred eleven".