30310331021 has 2 divisors, whose sum is σ = 30310331022. Its totient is φ = 30310331020.

The previous prime is 30310330997. The next prime is 30310331089. The reversal of 30310331021 is 12013301303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29932806121 + 377524900 = 173011^2 + 19430^2 .

It is a cyclic number.

It is not a de Polignac number, because 30310331021 - 2³⁴ = 13130461837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30310330021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15155165510 + 15155165511.

It is an arithmetic number, because the mean of its divisors is an integer number (15155165511).

Almost surely, 2^30310331021 is an apocalyptic number.

It is an amenable number.

30310331021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30310331021 is an equidigital number, since it uses as much as digits as its factorization.

30310331021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 30310331021 its reverse (12013301303), we get a palindrome (42323632324).

The spelling of 30310331021 in words is "thirty billion, three hundred ten million, three hundred thirty-one thousand, twenty-one".