111102221 has 2 divisors, whose sum is σ = 111102222. Its totient is φ = 111102220.

The previous prime is 111102209. The next prime is 111102227. The reversal of 111102221 is 122201111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97515625 + 13586596 = 9875^2 + 3686^2 .

It is an emirp because it is prime and its reverse (122201111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111102221 - 2²⁶ = 43993357 is a prime.

It is a super-2 number, since 2×111102221² = 24687407022265682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111102227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55551110 + 55551111.

It is an arithmetic number, because the mean of its divisors is an integer number (55551111).

Almost surely, 2^111102221 is an apocalyptic number.

It is an amenable number.

111102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111102221 is an equidigital number, since it uses as much as digits as its factorization.

111102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 111102221 is about 10540.5038304628. The cubic root of 111102221 is about 480.7370346682.

Adding to 111102221 its reverse (122201111), we get a palindrome (233303332).

It can be divided in two parts, 11110 and 2221, that added together give a palindrome (13331).

The spelling of 111102221 in words is "one hundred eleven million, one hundred two thousand, two hundred twenty-one".