31316623213021 has 8 divisors (see below), whose sum is σ = 31437004629888. Its totient is φ = 31196277252000.

The previous prime is 31316623213013. The next prime is 31316623213039. The reversal of 31316623213021 is 12031232661313.

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 31316623213021 - 2³ = 31316623213013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316693213021) 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, 7093375 + ... + 10627756.

It is an arithmetic number, because the mean of its divisors is an integer number (3929625578736).

Almost surely, 2^{31316623213021} is an apocalyptic number.

It is an amenable number.

31316623213021 is a deficient number, since it is larger than the sum of its proper divisors (120381416867).

31316623213021 is a wasteful number, since it uses less digits than its factorization.

31316623213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17727923.

The product of its (nonzero) digits is 23328, while the sum is 34.

Adding to 31316623213021 its reverse (12031232661313), we get a palindrome (43347855874334).

The spelling of 31316623213021 in words is "thirty-one trillion, three hundred sixteen billion, six hundred twenty-three million, two hundred thirteen thousand, twenty-one".