31301323321 has 4 divisors (see below), whose sum is σ = 33142577652. Its totient is φ = 29460068992.

The previous prime is 31301323309. The next prime is 31301323327. The reversal of 31301323321 is 12332310313.

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 20032439296 + 11268884025 = 141536^2 + 106155^2 .

It is a cyclic number.

It is not a de Polignac number, because 31301323321 - 2²³ = 31292934713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31301323292 and 31301323301.

It is not an unprimeable number, because it can be changed into a prime (31301323327) 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 3 ways as a sum of consecutive naturals, for example, 920627140 + ... + 920627173.

It is an arithmetic number, because the mean of its divisors is an integer number (8285644413).

Almost surely, 2^31301323321 is an apocalyptic number.

It is an amenable number.

31301323321 is a deficient number, since it is larger than the sum of its proper divisors (1841254331).

31301323321 is a wasteful number, since it uses less digits than its factorization.

31301323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841254330.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31301323321 its reverse (12332310313), we get a palindrome (43633633634).

The spelling of 31301323321 in words is "thirty-one billion, three hundred one million, three hundred twenty-three thousand, three hundred twenty-one".