31310023021 has 8 divisors (see below), whose sum is σ = 31392748800. Its totient is φ = 31227337680.

The previous prime is 31310023013. The next prime is 31310023061. The reversal of 31310023021 is 12032001313.

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

It is a cyclic number.

It is not a de Polignac number, because 31310023021 - 2³ = 31310023013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31310022986 and 31310023004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310023061) 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, 2114040 + ... + 2128798.

It is an arithmetic number, because the mean of its divisors is an integer number (3924093600).

Almost surely, 2^31310023021 is an apocalyptic number.

It is an amenable number.

31310023021 is a deficient number, since it is larger than the sum of its proper divisors (82725779).

31310023021 is a wasteful number, since it uses less digits than its factorization.

31310023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20219.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31310023021 its reverse (12032001313), we get a palindrome (43342024334).

The spelling of 31310023021 in words is "thirty-one billion, three hundred ten million, twenty-three thousand, twenty-one".