111112221 has 64 divisors (see below), whose sum is σ = 180838656. Its totient is φ = 59904000.

The previous prime is 111112219. The next prime is 111112237. The reversal of 111112221 is 122211111.

It is not a de Polignac number, because 111112221 - 2¹ = 111112219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111112197 and 111112206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1100071 + ... + 1100171.

It is an arithmetic number, because the mean of its divisors is an integer number (2825604).

Almost surely, 2^111112221 is an apocalyptic number.

111112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111112221 is a deficient number, since it is larger than the sum of its proper divisors (69726435).

111112221 is a wasteful number, since it uses less digits than its factorization.

111112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222.

The product of its digits is 8, while the sum is 12.

The square root of 111112221 is about 10540.9781804157. The cubic root of 111112221 is about 480.7514575006.

Adding to 111112221 its reverse (122211111), we get a palindrome (233323332).

It can be divided in two parts, 1111 and 12221, that multiplied together give a palindrome (13577531).

The spelling of 111112221 in words is "one hundred eleven million, one hundred twelve thousand, two hundred twenty-one".