111221123 has 16 divisors (see below), whose sum is σ = 132342336. Its totient is φ = 92421120.

The previous prime is 111221101. The next prime is 111221141. The reversal of 111221123 is 321122111.

It is a cyclic number.

It is not a de Polignac number, because 111221123 - 2⁸ = 111220867 is a prime.

It is a super-2 number, since 2×111221123² = 24740276402762258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221098 and 111221107.

It is not an unprimeable number, because it can be changed into a prime (111221153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5858 + ... + 16023.

It is an arithmetic number, because the mean of its divisors is an integer number (8271396).

Almost surely, 2^111221123 is an apocalyptic number.

111221123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

111221123 is a deficient number, since it is larger than the sum of its proper divisors (21121213).

111221123 is a wasteful number, since it uses less digits than its factorization.

111221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21934.

The product of its digits is 24, while the sum is 14.

The square root of 111221123 is about 10546.1425649381. The cubic root of 111221123 is about 480.9084690324.

Adding to 111221123 its reverse (321122111), we get a palindrome (432343234).

The spelling of 111221123 in words is "one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-three".