111100031221 has 16 divisors (see below), whose sum is σ = 113098669488. Its totient is φ = 109122048000.

The previous prime is 111100031213. The next prime is 111100031257. The reversal of 111100031221 is 122130001111.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5247408721 + 105852622500 = 72439^2 + 325350^2 .

It is a cyclic number.

It is not a de Polignac number, because 111100031221 - 2³ = 111100031213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100031261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9298111 + ... + 9310051.

It is an arithmetic number, because the mean of its divisors is an integer number (7068666843).

Almost surely, 2^111100031221 is an apocalyptic number.

It is an amenable number.

111100031221 is a deficient number, since it is larger than the sum of its proper divisors (1998638267).

111100031221 is a wasteful number, since it uses less digits than its factorization.

111100031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12792.

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

Adding to 111100031221 its reverse (122130001111), we get a palindrome (233230032332).

The spelling of 111100031221 in words is "one hundred eleven billion, one hundred million, thirty-one thousand, two hundred twenty-one".