111112121221123 has 16 divisors (see below), whose sum is σ = 122217322740192. Its totient is φ = 101009087414400.

The previous prime is 111112121221103. The next prime is 111112121221147. The reversal of 111112121221123 is 321122121211111.

It is a de Polignac number, because none of the positive numbers 2^k-111112121221123 is a prime.

It is a super-2 number, since 2×111112121221123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111112121221094 and 111112121221103.

It is not an unprimeable number, because it can be changed into a prime (111112121221103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71263815 + ... + 72806287.

It is an arithmetic number, because the mean of its divisors is an integer number (7638582671262).

Almost surely, 2^{111112121221123} is an apocalyptic number.

111112121221123 is a deficient number, since it is larger than the sum of its proper divisors (11105201519069).

111112121221123 is an equidigital number, since it uses as much as digits as its factorization.

111112121221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596627 (or 1596605 counting only the distinct ones).

The product of its digits is 96, while the sum is 22.

Adding to 111112121221123 its reverse (321122121211111), we get a palindrome (432234242432234).

The spelling of 111112121221123 in words is "one hundred eleven trillion, one hundred twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-three".