111123001020 has 96 divisors (see below), whose sum is σ = 314302464000. Its totient is φ = 29333090304.

The previous prime is 111123001007. The next prime is 111123001039. The reversal of 111123001020 is 20100321111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 111123000987 and 111123001005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3405141 + ... + 3437619.

It is an arithmetic number, because the mean of its divisors is an integer number (3273984000).

Almost surely, 2^111123001020 is an apocalyptic number.

111123001020 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 111123001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157151232000).

111123001020 is an abundant number, since it is smaller than the sum of its proper divisors (203179462980).

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

111123001020 is a wasteful number, since it uses less digits than its factorization.

111123001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33067 (or 33065 counting only the distinct ones).

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

Adding to 111123001020 its reverse (20100321111), we get a palindrome (131223322131).

The spelling of 111123001020 in words is "one hundred eleven billion, one hundred twenty-three million, one thousand, twenty".