31311011303321 has 4 divisors (see below), whose sum is σ = 33152835497652. Its totient is φ = 29469187108992.

The previous prime is 31311011303191. The next prime is 31311011303333. The reversal of 31311011303321 is 12330311011313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24433693872025 + 6877317431296 = 4943045^2 + 2622464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311011303321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311011303021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920912097140 + ... + 920912097173.

It is an arithmetic number, because the mean of its divisors is an integer number (8288208874413).

Almost surely, 2^{31311011303321} is an apocalyptic number.

It is an amenable number.

31311011303321 is a deficient number, since it is larger than the sum of its proper divisors (1841824194331).

31311011303321 is a wasteful number, since it uses less digits than its factorization.

31311011303321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841824194330.

The product of its (nonzero) digits is 486, while the sum is 23.

Adding to 31311011303321 its reverse (12330311011313), we get a palindrome (43641322314634).

The spelling of 31311011303321 in words is "thirty-one trillion, three hundred eleven billion, eleven million, three hundred three thousand, three hundred twenty-one".