31368245021 has 2 divisors, whose sum is σ = 31368245022. Its totient is φ = 31368245020.

The previous prime is 31368245003. The next prime is 31368245039. The reversal of 31368245021 is 12054286313.

It is a balanced prime because it is at equal distance from previous prime (31368245003) and next prime (31368245039).

It can be written as a sum of positive squares in only one way, i.e., 25317583225 + 6050661796 = 159115^2 + 77786^2 .

It is an emirp because it is prime and its reverse (12054286313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31368245021 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 (31368245071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15684122510 + 15684122511.

It is an arithmetic number, because the mean of its divisors is an integer number (15684122511).

Almost surely, 2^31368245021 is an apocalyptic number.

It is an amenable number.

31368245021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31368245021 is an equidigital number, since it uses as much as digits as its factorization.

31368245021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 31368245021 in words is "thirty-one billion, three hundred sixty-eight million, two hundred forty-five thousand, twenty-one".