138485516221 has 8 divisors (see below), whose sum is σ = 149177009240. Its totient is φ = 127799560512.

The previous prime is 138485516219. The next prime is 138485516233. The reversal of 138485516221 is 122615584831.

138485516221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19418422500 + 119067093721 = 139350^2 + 345061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138485516221 - 2¹ = 138485516219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138485516321) 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 in 7 ways as a sum of consecutive naturals, for example, 1332306 + ... + 1432483.

It is an arithmetic number, because the mean of its divisors is an integer number (18647126155).

Almost surely, 2^138485516221 is an apocalyptic number.

It is an amenable number.

138485516221 is a deficient number, since it is larger than the sum of its proper divisors (10691493019).

138485516221 is a wasteful number, since it uses less digits than its factorization.

138485516221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768655.

The product of its digits is 460800, while the sum is 46.

The spelling of 138485516221 in words is "one hundred thirty-eight billion, four hundred eighty-five million, five hundred sixteen thousand, two hundred twenty-one".