111031130021 has 12 divisors (see below), whose sum is σ = 129294244332. Its totient is φ = 95069636928.

The previous prime is 111031129991. The next prime is 111031130033. The reversal of 111031130021 is 120031130111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 34280522500 + 76750607521 = 185150^2 + 277039^2 .

It is a de Polignac number, because none of the positive numbers 2^k-111031130021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111031129978 and 111031130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111031130621) 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, 1142150 + ... + 1235543.

It is an arithmetic number, because the mean of its divisors is an integer number (10774520361).

Almost surely, 2^111031130021 is an apocalyptic number.

It is an amenable number.

111031130021 is a deficient number, since it is larger than the sum of its proper divisors (18263114311).

111031130021 is an equidigital number, since it uses as much as digits as its factorization.

111031130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378660 (or 2378653 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 111031130021 its reverse (120031130111), we get a palindrome (231062260132).

The spelling of 111031130021 in words is "one hundred eleven billion, thirty-one million, one hundred thirty thousand, twenty-one".