231320404021 has 4 divisors (see below), whose sum is σ = 264366176032. Its totient is φ = 198274632012.

The previous prime is 231320404019. The next prime is 231320404039. The reversal of 231320404021 is 120404023132.

231320404021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 231320404021 - 2¹ = 231320404019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231320403983 and 231320404001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231320404061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16522885995 + ... + 16522886008.

It is an arithmetic number, because the mean of its divisors is an integer number (66091544008).

Almost surely, 2^231320404021 is an apocalyptic number.

It is an amenable number.

231320404021 is a deficient number, since it is larger than the sum of its proper divisors (33045772011).

231320404021 is an equidigital number, since it uses as much as digits as its factorization.

231320404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33045772010.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 231320404021 its reverse (120404023132), we get a palindrome (351724427153).

The spelling of 231320404021 in words is "two hundred thirty-one billion, three hundred twenty million, four hundred four thousand, twenty-one".