231321312021 has 32 divisors (see below), whose sum is σ = 322979747328. Its totient is φ = 147141296640.

The previous prime is 231321312011. The next prime is 231321312031. The reversal of 231321312021 is 120213123132.

It is an interprime number because it is at equal distance from previous prime (231321312011) and next prime (231321312031).

It is not a de Polignac number, because 231321312021 - 2⁵ = 231321311989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321312011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1074681 + ... + 1271841.

It is an arithmetic number, because the mean of its divisors is an integer number (10093117104).

Almost surely, 2^231321312021 is an apocalyptic number.

It is an amenable number.

231321312021 is a deficient number, since it is larger than the sum of its proper divisors (91658435307).

231321312021 is a wasteful number, since it uses less digits than its factorization.

231321312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197421.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 231321312021 its reverse (120213123132), we get a palindrome (351534435153).

The spelling of 231321312021 in words is "two hundred thirty-one billion, three hundred twenty-one million, three hundred twelve thousand, twenty-one".