31303214321 has 2 divisors, whose sum is σ = 31303214322. Its totient is φ = 31303214320.

The previous prime is 31303214309. The next prime is 31303214357. The reversal of 31303214321 is 12341230313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28647255025 + 2655959296 = 169255^2 + 51536^2 .

It is a cyclic number.

It is not a de Polignac number, because 31303214321 - 2²⁶ = 31236105457 is a prime.

It is not a weakly prime, because it can be changed into another prime (31303214221) 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 as a sum of consecutive naturals, namely, 15651607160 + 15651607161.

It is an arithmetic number, because the mean of its divisors is an integer number (15651607161).

Almost surely, 2^31303214321 is an apocalyptic number.

It is an amenable number.

31303214321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31303214321 is an equidigital number, since it uses as much as digits as its factorization.

31303214321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31303214321 its reverse (12341230313), we get a palindrome (43644444634).

The spelling of 31303214321 in words is "thirty-one billion, three hundred three million, two hundred fourteen thousand, three hundred twenty-one".