111021120012 has 96 divisors (see below), whose sum is σ = 293674752000. Its totient is φ = 32338828800.

The previous prime is 111021120011. The next prime is 111021120061. The reversal of 111021120012 is 210021120111.

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

It is a self number, because there is not a number n which added to its sum of digits gives 111021120012.

It is not an unprimeable number, because it can be changed into a prime (111021120011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 518664 + ... + 700752.

It is an arithmetic number, because the mean of its divisors is an integer number (3059112000).

Almost surely, 2^111021120012 is an apocalyptic number.

111021120012 is a gapful number since it is divisible by the number (12) 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 111021120012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146837376000).

111021120012 is an abundant number, since it is smaller than the sum of its proper divisors (182653631988).

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

111021120012 is a wasteful number, since it uses less digits than its factorization.

111021120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182287 (or 182285 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111021120012 its reverse (210021120111), we get a palindrome (321042240123).

Subtracting 111021120012 from its reverse (210021120111), we obtain a palindrome (99000000099).

The spelling of 111021120012 in words is "one hundred eleven billion, twenty-one million, one hundred twenty thousand, twelve".