231031403304021 has 6 divisors (see below), whose sum is σ = 333712026994710. Its totient is φ = 154020935536008.

The previous prime is 231031403304017. The next prime is 231031403304041. The reversal of 231031403304021 is 120403304130132.

It is a happy number.

231031403304021 is a `hidden beast` number, since 2 + 3 + 10 + 314 + 0 + 330 + 4 + 0 + 2 + 1 = 666.

231031403304021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 231016866179121 + 14537124900 = 15199239^2 + 120570^2 .

It is not a de Polignac number, because 231031403304021 - 2² = 231031403304017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231031403304041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12835077961326 + ... + 12835077961343.

It is an arithmetic number, because the mean of its divisors is an integer number (55618671165785).

Almost surely, 2^{231031403304021} is an apocalyptic number.

It is an amenable number.

231031403304021 is a deficient number, since it is larger than the sum of its proper divisors (102680623690689).

231031403304021 is a wasteful number, since it uses less digits than its factorization.

231031403304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25670155922675 (or 25670155922672 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 231031403304021 its reverse (120403304130132), we get a palindrome (351434707434153).

The spelling of 231031403304021 in words is "two hundred thirty-one trillion, thirty-one billion, four hundred three million, three hundred four thousand, twenty-one".