138298722721 has 8 divisors (see below), whose sum is σ = 139072961664. Its totient is φ = 137524595760.

The previous prime is 138298722707. The next prime is 138298722743. The reversal of 138298722721 is 127227892831.

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

It is a cyclic number.

It is not a de Polignac number, because 138298722721 - 2¹³ = 138298714529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138298723721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4343160 + ... + 4374886.

It is an arithmetic number, because the mean of its divisors is an integer number (17384120208).

Almost surely, 2^138298722721 is an apocalyptic number.

It is an amenable number.

138298722721 is a deficient number, since it is larger than the sum of its proper divisors (774238943).

138298722721 is a wasteful number, since it uses less digits than its factorization.

138298722721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55991.

The product of its digits is 1354752, while the sum is 52.

The spelling of 138298722721 in words is "one hundred thirty-eight billion, two hundred ninety-eight million, seven hundred twenty-two thousand, seven hundred twenty-one".