111220101 has 8 divisors (see below), whose sum is σ = 164770560. Its totient is φ = 74146716.

The previous prime is 111220097. The next prime is 111220117. The reversal of 111220101 is 101022111.

It is a happy number.

It is not a de Polignac number, because 111220101 - 2² = 111220097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2059605 + ... + 2059658.

It is an arithmetic number, because the mean of its divisors is an integer number (20596320).

Almost surely, 2^111220101 is an apocalyptic number.

It is an amenable number.

111220101 is a deficient number, since it is larger than the sum of its proper divisors (53550459).

111220101 is an equidigital number, since it uses as much as digits as its factorization.

111220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119272 (or 4119266 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 111220101 is about 10546.0941110916. The cubic root of 111220101 is about 480.9069960210.

Adding to 111220101 its reverse (101022111), we get a palindrome (212242212).

The spelling of 111220101 in words is "one hundred eleven million, two hundred twenty thousand, one hundred one".