111401431021 has 4 divisors (see below), whose sum is σ = 111404848252. Its totient is φ = 111398013792.

The previous prime is 111401431013. The next prime is 111401431049. The reversal of 111401431021 is 120134104111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81684498025 + 29716932996 = 285805^2 + 172386^2 .

It is a cyclic number.

It is not a de Polignac number, because 111401431021 - 2³ = 111401431013 is a prime.

It is a super-2 number, since 2×111401431021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111401431021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111401438021) 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, 1659240 + ... + 1725073.

It is an arithmetic number, because the mean of its divisors is an integer number (27851212063).

Almost surely, 2^111401431021 is an apocalyptic number.

It is an amenable number.

111401431021 is a deficient number, since it is larger than the sum of its proper divisors (3417231).

111401431021 is an equidigital number, since it uses as much as digits as its factorization.

111401431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417230.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 111401431021 its reverse (120134104111), we get a palindrome (231535535132).

The spelling of 111401431021 in words is "one hundred eleven billion, four hundred one million, four hundred thirty-one thousand, twenty-one".