138575221042 has 8 divisors (see below), whose sum is σ = 215030515500. Its totient is φ = 66898382544.

The previous prime is 138575221021. The next prime is 138575221097. The reversal of 138575221042 is 240122575831.

It can be written as a sum of positive squares in 2 ways, for example, as 132386094801 + 6189126241 = 363849^2 + 78671^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 138575220986 and 138575221004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1194613917 + ... + 1194614032.

Almost surely, 2^138575221042 is an apocalyptic number.

138575221042 is a deficient number, since it is larger than the sum of its proper divisors (76455294458).

138575221042 is a wasteful number, since it uses less digits than its factorization.

138575221042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389227980.

The product of its (nonzero) digits is 134400, while the sum is 40.

Adding to 138575221042 its reverse (240122575831), we get a palindrome (378697796873).

The spelling of 138575221042 in words is "one hundred thirty-eight billion, five hundred seventy-five million, two hundred twenty-one thousand, forty-two".