31231320310021 has 8 divisors (see below), whose sum is σ = 33645412039680. Its totient is φ = 28818897505392.

The previous prime is 31231320310019. The next prime is 31231320310049. The reversal of 31231320310021 is 12001302313213.

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 31231320310021 - 2¹ = 31231320310019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31231320309974 and 31231320310001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231326310021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417192385 + ... + 417267238.

It is an arithmetic number, because the mean of its divisors is an integer number (4205676504960).

Almost surely, 2^{31231320310021} is an apocalyptic number.

It is an amenable number.

31231320310021 is a deficient number, since it is larger than the sum of its proper divisors (2414091729659).

31231320310021 is a wasteful number, since it uses less digits than its factorization.

31231320310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834462515.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31231320310021 its reverse (12001302313213), we get a palindrome (43232622623234).

The spelling of 31231320310021 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty million, three hundred ten thousand, twenty-one".