231321020331 has 16 divisors (see below), whose sum is σ = 327236001408. Its totient is φ = 144846979200.

The previous prime is 231321020267. The next prime is 231321020383. The reversal of 231321020331 is 133020123132.

It is not a de Polignac number, because 231321020331 - 2⁶ = 231321020267 is a prime.

It is a super-2 number, since 2×231321020331² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231321020298 and 231321020307.

It is not an unprimeable number, because it can be changed into a prime (231311020331) 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, 4593805 + ... + 4643886.

It is an arithmetic number, because the mean of its divisors is an integer number (20452250088).

Almost surely, 2^231321020331 is an apocalyptic number.

231321020331 is a deficient number, since it is larger than the sum of its proper divisors (95914981077).

231321020331 is a wasteful number, since it uses less digits than its factorization.

231321020331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9238202.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 231321020331 its reverse (133020123132), we get a palindrome (364341143463).

The spelling of 231321020331 in words is "two hundred thirty-one billion, three hundred twenty-one million, twenty thousand, three hundred thirty-one".