438513903874021 has 2 divisors, whose sum is σ = 438513903874022. Its totient is φ = 438513903874020.

The previous prime is 438513903874009. The next prime is 438513903874061. The reversal of 438513903874021 is 120478309315834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245608888423396 + 192905015450625 = 15671914^2 + 13889025^2 .

It is a cyclic number.

It is not a de Polignac number, because 438513903874021 - 2⁵ = 438513903873989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438513903874001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219256951937010 + 219256951937011.

It is an arithmetic number, because the mean of its divisors is an integer number (219256951937011).

Almost surely, 2^{438513903874021} is an apocalyptic number.

It is an amenable number.

438513903874021 is a deficient number, since it is larger than the sum of its proper divisors (1).

438513903874021 is an equidigital number, since it uses as much as digits as its factorization.

438513903874021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 58.

The spelling of 438513903874021 in words is "four hundred thirty-eight trillion, five hundred thirteen billion, nine hundred three million, eight hundred seventy-four thousand, twenty-one".