111021312 has 72 divisors (see below), whose sum is σ = 303542176. Its totient is φ = 35997696.

The previous prime is 111021283. The next prime is 111021319. The reversal of 111021312 is 213120111.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26463 + ... + 30369.

Almost surely, 2^111021312 is an apocalyptic number.

111021312 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 111021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151771088).

111021312 is an abundant number, since it is smaller than the sum of its proper divisors (192520864).

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

111021312 is an equidigital number, since it uses as much as digits as its factorization.

111021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963 (or 3949 counting only the distinct ones).

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

The square root of 111021312 is about 10536.6651270694. The cubic root of 111021312 is about 480.6203091337.

Adding to 111021312 its reverse (213120111), we get a palindrome (324141423).

It can be divided in two parts, 1110 and 21312, that added together give a palindrome (22422).

The spelling of 111021312 in words is "one hundred eleven million, twenty-one thousand, three hundred twelve".