38240047921 has 2 divisors, whose sum is σ = 38240047922. Its totient is φ = 38240047920.

The previous prime is 38240047907. The next prime is 38240047939. The reversal of 38240047921 is 12974004283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38218295025 + 21752896 = 195495^2 + 4664^2 .

It is an emirp because it is prime and its reverse (12974004283) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38240047921 - 2⁹ = 38240047409 is a prime.

It is not a weakly prime, because it can be changed into another prime (38240347921) 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, 19120023960 + 19120023961.

It is an arithmetic number, because the mean of its divisors is an integer number (19120023961).

Almost surely, 2^38240047921 is an apocalyptic number.

It is an amenable number.

38240047921 is a deficient number, since it is larger than the sum of its proper divisors (1).

38240047921 is an equidigital number, since it uses as much as digits as its factorization.

38240047921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 38240047921 in words is "thirty-eight billion, two hundred forty million, forty-seven thousand, nine hundred twenty-one".