138567084521 has 2 divisors, whose sum is σ = 138567084522. Its totient is φ = 138567084520.

The previous prime is 138567084511. The next prime is 138567084533. The reversal of 138567084521 is 125480765831.

138567084521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120440232025 + 18126852496 = 347045^2 + 134636^2 .

It is an emirp because it is prime and its reverse (125480765831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138567084521 - 2³⁰ = 137493342697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138567084521.

It is not a weakly prime, because it can be changed into another prime (138567084511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69283542260 + 69283542261.

It is an arithmetic number, because the mean of its divisors is an integer number (69283542261).

Almost surely, 2^138567084521 is an apocalyptic number.

It is an amenable number.

138567084521 is a deficient number, since it is larger than the sum of its proper divisors (1).

138567084521 is an equidigital number, since it uses as much as digits as its factorization.

138567084521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 138567084521 in words is "one hundred thirty-eight billion, five hundred sixty-seven million, eighty-four thousand, five hundred twenty-one".