138148683523921 has 4 divisors (see below), whose sum is σ = 157884209741632. Its totient is φ = 118413157306212.

The previous prime is 138148683523901. The next prime is 138148683523931. The reversal of 138148683523921 is 129325386841831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138148683523921 - 2¹³ = 138148683515729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138148683523901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9867763108845 + ... + 9867763108858.

It is an arithmetic number, because the mean of its divisors is an integer number (39471052435408).

Almost surely, 2^{138148683523921} is an apocalyptic number.

It is an amenable number.

138148683523921 is a deficient number, since it is larger than the sum of its proper divisors (19735526217711).

138148683523921 is an equidigital number, since it uses as much as digits as its factorization.

138148683523921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19735526217710.

The product of its digits is 59719680, while the sum is 64.

The spelling of 138148683523921 in words is "one hundred thirty-eight trillion, one hundred forty-eight billion, six hundred eighty-three million, five hundred twenty-three thousand, nine hundred twenty-one".