31231023321 has 8 divisors (see below), whose sum is σ = 41642238784. Its totient is φ = 20820245040.

The previous prime is 31231023283. The next prime is 31231023379. The reversal of 31231023321 is 12332013213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31231023321 - 2¹⁹ = 31230499033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231023721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136116 + ... + 284586.

It is an arithmetic number, because the mean of its divisors is an integer number (5205279848).

Almost surely, 2^31231023321 is an apocalyptic number.

It is an amenable number.

31231023321 is a deficient number, since it is larger than the sum of its proper divisors (10411215463).

31231023321 is a wasteful number, since it uses less digits than its factorization.

31231023321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218591.

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

Adding to 31231023321 its reverse (12332013213), we get a palindrome (43563036534).

The spelling of 31231023321 in words is "thirty-one billion, two hundred thirty-one million, twenty-three thousand, three hundred twenty-one".