111113221 has 2 divisors, whose sum is σ = 111113222. Its totient is φ = 111113220.

The previous prime is 111113213. The next prime is 111113237. The reversal of 111113221 is 122311111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73290721 + 37822500 = 8561^2 + 6150^2 .

It is a cyclic number.

It is not a de Polignac number, because 111113221 - 2³ = 111113213 is a prime.

It is a super-2 number, since 2×111113221² = 24692295761989682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111113201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55556610 + 55556611.

It is an arithmetic number, because the mean of its divisors is an integer number (55556611).

Almost surely, 2^111113221 is an apocalyptic number.

It is an amenable number.

111113221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111113221 is an equidigital number, since it uses as much as digits as its factorization.

111113221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12, while the sum is 13.

The square root of 111113221 is about 10541.0256142370. The cubic root of 111113221 is about 480.7528997362.

Adding to 111113221 its reverse (122311111), we get a palindrome (233424332).

The spelling of 111113221 in words is "one hundred eleven million, one hundred thirteen thousand, two hundred twenty-one".