231323332021 has 4 divisors (see below), whose sum is σ = 231324552844. Its totient is φ = 231322111200.

The previous prime is 231323332007. The next prime is 231323332087. The reversal of 231323332021 is 120233323132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 113872502500 + 117450829521 = 337450^2 + 342711^2 .

It is a cyclic number.

It is not a de Polignac number, because 231323332021 - 2⁵ = 231323331989 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 (231323332621) 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, 258600 + ... + 727681.

It is an arithmetic number, because the mean of its divisors is an integer number (57831138211).

Almost surely, 2^231323332021 is an apocalyptic number.

It is an amenable number.

231323332021 is a deficient number, since it is larger than the sum of its proper divisors (1220823).

231323332021 is an equidigital number, since it uses as much as digits as its factorization.

231323332021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220822.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 231323332021 its reverse (120233323132), we get a palindrome (351556655153).

The spelling of 231323332021 in words is "two hundred thirty-one billion, three hundred twenty-three million, three hundred thirty-two thousand, twenty-one".