111220812 has 36 divisors (see below), whose sum is σ = 285756016. Its totient is φ = 36465120.

The previous prime is 111220757. The next prime is 111220819. The reversal of 111220812 is 218022111.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (111220819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23128 + ... + 27519.

Almost surely, 2^111220812 is an apocalyptic number.

111220812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111220812 is an abundant number, since it is smaller than the sum of its proper divisors (174535204).

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

111220812 is a wasteful number, since it uses less digits than its factorization.

111220812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50718 (or 50713 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 111220812 is about 10546.1278202002. The cubic root of 111220812 is about 480.9080207882.

Adding to 111220812 its reverse (218022111), we get a palindrome (329242923).

The spelling of 111220812 in words is "one hundred eleven million, two hundred twenty thousand, eight hundred twelve".