111221110111 has 4 divisors (see below), whose sum is σ = 111785684472. Its totient is φ = 110656535752.

The previous prime is 111221110079. The next prime is 111221110181. The reversal of 111221110111 is 111011122111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111011122111 = 171179 ⋅648509.

It is a cyclic number.

It is not a de Polignac number, because 111221110111 - 2⁵ = 111221110079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221110091 and 111221110100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221110181) 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, 282286885 + ... + 282287278.

It is an arithmetic number, because the mean of its divisors is an integer number (27946421118).

Almost surely, 2^111221110111 is an apocalyptic number.

111221110111 is a deficient number, since it is larger than the sum of its proper divisors (564574361).

111221110111 is an equidigital number, since it uses as much as digits as its factorization.

111221110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564574360.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111221110111 its reverse (111011122111), we get a palindrome (222232232222).

The spelling of 111221110111 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred ten thousand, one hundred eleven".