31320311311021 has 4 divisors (see below), whose sum is σ = 31333301902944. Its totient is φ = 31307320719100.

The previous prime is 31320311311001. The next prime is 31320311311049. The reversal of 31320311311021 is 12011311302313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31320311311021 - 2²³ = 31320302922413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31320311310983 and 31320311311001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320311311001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6495292345 + ... + 6495297166.

It is an arithmetic number, because the mean of its divisors is an integer number (7833325475736).

Almost surely, 2^{31320311311021} is an apocalyptic number.

It is an amenable number.

31320311311021 is a deficient number, since it is larger than the sum of its proper divisors (12990591923).

31320311311021 is a wasteful number, since it uses less digits than its factorization.

31320311311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12990591922.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31320311311021 its reverse (12011311302313), we get a palindrome (43331622613334).

The spelling of 31320311311021 in words is "thirty-one trillion, three hundred twenty billion, three hundred eleven million, three hundred eleven thousand, twenty-one".