138732221038 has 4 divisors (see below), whose sum is σ = 208098331560. Its totient is φ = 69366110518.

The previous prime is 138732220997. The next prime is 138732221041. The reversal of 138732221038 is 830122237831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 830122237831 = 47 ⋅17662175273.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34683055258 + ... + 34683055261.

It is an arithmetic number, because the mean of its divisors is an integer number (52024582890).

Almost surely, 2^138732221038 is an apocalyptic number.

138732221038 is a deficient number, since it is larger than the sum of its proper divisors (69366110522).

138732221038 is an equidigital number, since it uses as much as digits as its factorization.

138732221038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69366110521.

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 138732221038 its reverse (830122237831), we get a palindrome (968854458869).

The spelling of 138732221038 in words is "one hundred thirty-eight billion, seven hundred thirty-two million, two hundred twenty-one thousand, thirty-eight".