138888144521 has 12 divisors (see below), whose sum is σ = 161624581632. Its totient is φ = 119002165128.

The previous prime is 138888144511. The next prime is 138888144529. The reversal of 138888144521 is 125441888831.

It is a happy number.

It is not a de Polignac number, because 138888144521 - 2⁶ = 138888144457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138888144529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 401705 + ... + 662678.

It is an arithmetic number, because the mean of its divisors is an integer number (13468715136).

Almost surely, 2^138888144521 is an apocalyptic number.

It is an amenable number.

138888144521 is a deficient number, since it is larger than the sum of its proper divisors (22736437111).

138888144521 is a wasteful number, since it uses less digits than its factorization.

138888144521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067060 (or 1067053 counting only the distinct ones).

The product of its digits is 1966080, while the sum is 53.

The spelling of 138888144521 in words is "one hundred thirty-eight billion, eight hundred eighty-eight million, one hundred forty-four thousand, five hundred twenty-one".