38345864021 has 2 divisors, whose sum is σ = 38345864022. Its totient is φ = 38345864020.

The previous prime is 38345863987. The next prime is 38345864047. The reversal of 38345864021 is 12046854383.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23843683396 + 14502180625 = 154414^2 + 120425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38345864021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38345864621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19172932010 + 19172932011.

It is an arithmetic number, because the mean of its divisors is an integer number (19172932011).

Almost surely, 2^38345864021 is an apocalyptic number.

It is an amenable number.

38345864021 is a deficient number, since it is larger than the sum of its proper divisors (1).

38345864021 is an equidigital number, since it uses as much as digits as its factorization.

38345864021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 38345864021 in words is "thirty-eight billion, three hundred forty-five million, eight hundred sixty-four thousand, twenty-one".