231330311021 has 4 divisors (see below), whose sum is σ = 232153550844. Its totient is φ = 230507071200.

The previous prime is 231330310993. The next prime is 231330311029. The reversal of 231330311021 is 120113033132.

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 181505821225 + 49824489796 = 426035^2 + 223214^2 .

It is a cyclic number.

It is not a de Polignac number, because 231330311021 - 2⁶ = 231330310957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231330310984 and 231330311002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231330311029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411619490 + ... + 411620051.

It is an arithmetic number, because the mean of its divisors is an integer number (58038387711).

Almost surely, 2^231330311021 is an apocalyptic number.

It is an amenable number.

231330311021 is a deficient number, since it is larger than the sum of its proper divisors (823239823).

231330311021 is an equidigital number, since it uses as much as digits as its factorization.

231330311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823239822.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 231330311021 its reverse (120113033132), we get a palindrome (351443344153).

The spelling of 231330311021 in words is "two hundred thirty-one billion, three hundred thirty million, three hundred eleven thousand, twenty-one".