231312310021 has 16 divisors (see below), whose sum is σ = 254924296704. Its totient is φ = 208532568384.

The previous prime is 231312310003. The next prime is 231312310067. The reversal of 231312310021 is 120013213132.

It is a cyclic number.

It is not a de Polignac number, because 231312310021 - 2¹⁷ = 231312178949 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 (231312310001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9270855 + ... + 9295771.

It is an arithmetic number, because the mean of its divisors is an integer number (15932768544).

Almost surely, 2^231312310021 is an apocalyptic number.

It is an amenable number.

231312310021 is a deficient number, since it is larger than the sum of its proper divisors (23611986683).

231312310021 is a wasteful number, since it uses less digits than its factorization.

231312310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41580.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 231312310021 its reverse (120013213132), we get a palindrome (351325523153).

The spelling of 231312310021 in words is "two hundred thirty-one billion, three hundred twelve million, three hundred ten thousand, twenty-one".