138170833921 has 32 divisors (see below), whose sum is σ = 149731545600. Its totient is φ = 127038222336.

The previous prime is 138170833909. The next prime is 138170833973. The reversal of 138170833921 is 129338071831.

It is not a de Polignac number, because 138170833921 - 2¹⁹ = 138170309633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138170833991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40059405 + ... + 40062853.

It is an arithmetic number, because the mean of its divisors is an integer number (4679110800).

Almost surely, 2^138170833921 is an apocalyptic number.

It is an amenable number.

138170833921 is a deficient number, since it is larger than the sum of its proper divisors (11560711679).

138170833921 is a wasteful number, since it uses less digits than its factorization.

138170833921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 138170833921 in words is "one hundred thirty-eight billion, one hundred seventy million, eight hundred thirty-three thousand, nine hundred twenty-one".