111101220111 has 24 divisors (see below), whose sum is σ = 174396426624. Its totient is φ = 62721508080.

The previous prime is 111101220101. The next prime is 111101220133. The reversal of 111101220111 is 111022101111.

It is not a de Polignac number, because 111101220111 - 2²⁷ = 110967002383 is a prime.

It is a super-2 number, since 2×111101220111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101220101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4540755 + ... + 4565156.

It is an arithmetic number, because the mean of its divisors is an integer number (7266517776).

Almost surely, 2^111101220111 is an apocalyptic number.

111101220111 is a deficient number, since it is larger than the sum of its proper divisors (63295206513).

111101220111 is an equidigital number, since it uses as much as digits as its factorization.

111101220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9106011 (or 9106004 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 111101220111 its reverse (111022101111), we get a palindrome (222123321222).

The spelling of 111101220111 in words is "one hundred eleven billion, one hundred one million, two hundred twenty thousand, one hundred eleven".