111131130021 has 4 divisors (see below), whose sum is σ = 148174840032. Its totient is φ = 74087420012.

The previous prime is 111131130001. The next prime is 111131130073. The reversal of 111131130021 is 120031131111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120031131111 = 3 ⋅40010377037.

It is a cyclic number.

It is not a de Polignac number, because 111131130021 - 2³⁰ = 110057388197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111131130001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18521855001 + ... + 18521855006.

It is an arithmetic number, because the mean of its divisors is an integer number (37043710008).

Almost surely, 2^111131130021 is an apocalyptic number.

It is an amenable number.

111131130021 is a deficient number, since it is larger than the sum of its proper divisors (37043710011).

111131130021 is an equidigital number, since it uses as much as digits as its factorization.

111131130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37043710010.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 111131130021 its reverse (120031131111), we get a palindrome (231162261132).

The spelling of 111131130021 in words is "one hundred eleven billion, one hundred thirty-one million, one hundred thirty thousand, twenty-one".