31123023321 has 96 divisors (see below), whose sum is σ = 49551409152. Its totient is φ = 17237784960.

The previous prime is 31123023313. The next prime is 31123023331. The reversal of 31123023321 is 12332032113.

It is not a de Polignac number, because 31123023321 - 2³ = 31123023313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31123023331) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 72210976 + ... + 72211406.

It is an arithmetic number, because the mean of its divisors is an integer number (516160512).

Almost surely, 2^31123023321 is an apocalyptic number.

It is an amenable number.

31123023321 is a deficient number, since it is larger than the sum of its proper divisors (18428385831).

31123023321 is a wasteful number, since it uses less digits than its factorization.

31123023321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 712 counting only the distinct ones).

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

Adding to 31123023321 its reverse (12332032113), we get a palindrome (43455055434).

The spelling of 31123023321 in words is "thirty-one billion, one hundred twenty-three million, twenty-three thousand, three hundred twenty-one".