31020130321 has 2 divisors, whose sum is σ = 31020130322. Its totient is φ = 31020130320.

The previous prime is 31020130319. The next prime is 31020130327. The reversal of 31020130321 is 12303102013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23573303296 + 7446827025 = 153536^2 + 86295^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020130321 - 2¹ = 31020130319 is a prime.

Together with 31020130319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31020130295 and 31020130304.

It is not a weakly prime, because it can be changed into another prime (31020130327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510065160 + 15510065161.

It is an arithmetic number, because the mean of its divisors is an integer number (15510065161).

Almost surely, 2^31020130321 is an apocalyptic number.

It is an amenable number.

31020130321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020130321 is an equidigital number, since it uses as much as digits as its factorization.

31020130321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31020130321 its reverse (12303102013), we get a palindrome (43323232334).

The spelling of 31020130321 in words is "thirty-one billion, twenty million, one hundred thirty thousand, three hundred twenty-one".