138821171745238 has 8 divisors (see below), whose sum is σ = 208232335834488. Its totient is φ = 69410393133744.

The previous prime is 138821171745203. The next prime is 138821171745293. The reversal of 138821171745238 is 832547171128831.

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

It is a congruent number.

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, 95467431 + ... + 96910642.

It is an arithmetic number, because the mean of its divisors is an integer number (26029041979311).

Almost surely, 2^{138821171745238} is an apocalyptic number.

138821171745238 is a deficient number, since it is larger than the sum of its proper divisors (69411164089250).

138821171745238 is a wasteful number, since it uses less digits than its factorization.

138821171745238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192738878.

The product of its digits is 18063360, while the sum is 61.

The spelling of 138821171745238 in words is "one hundred thirty-eight trillion, eight hundred twenty-one billion, one hundred seventy-one million, seven hundred forty-five thousand, two hundred thirty-eight".