111531044221 has 12 divisors (see below), whose sum is σ = 117786924192. Its totient is φ = 105591984264.

The previous prime is 111531044171. The next prime is 111531044257. The reversal of 111531044221 is 122440135111.

It is a happy number.

It is not a de Polignac number, because 111531044221 - 2⁹ = 111531043709 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 (111531044281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 456910 + ... + 657136.

It is an arithmetic number, because the mean of its divisors is an integer number (9815577016).

Almost surely, 2^111531044221 is an apocalyptic number.

It is an amenable number.

111531044221 is a deficient number, since it is larger than the sum of its proper divisors (6255879971).

111531044221 is a wasteful number, since it uses less digits than its factorization.

111531044221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201808 (or 201789 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 111531044221 its reverse (122440135111), we get a palindrome (233971179332).

The spelling of 111531044221 in words is "one hundred eleven billion, five hundred thirty-one million, forty-four thousand, two hundred twenty-one".