111131223120 has 120 divisors (see below), whose sum is σ = 374022894336. Its totient is φ = 29570897664.

The previous prime is 111131223113. The next prime is 111131223131. The reversal of 111131223120 is 21322131111.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 111131223093 and 111131223102.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 166677 + ... + 500043.

Almost surely, 2^111131223120 is an apocalyptic number.

111131223120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111131223120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187011447168).

111131223120 is an abundant number, since it is smaller than the sum of its proper divisors (262891671216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111131223120 is a wasteful number, since it uses less digits than its factorization.

111131223120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333849 (or 333840 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 111131223120 its reverse (21322131111), we get a palindrome (132453354231).

The spelling of 111131223120 in words is "one hundred eleven billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred twenty".