38971912321 has 4 divisors (see below), whose sum is σ = 38972636500. Its totient is φ = 38971188144.

The previous prime is 38971912307. The next prime is 38971912367. The reversal of 38971912321 is 12321917983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12321917983 = 58699 ⋅209917.

It can be written as a sum of positive squares in 2 ways, for example, as 5196823921 + 33775088400 = 72089^2 + 183780^2 .

It is a cyclic number.

It is not a de Polignac number, because 38971912321 - 2⁵ = 38971912289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38971912921) 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, 274266 + ... + 391363.

It is an arithmetic number, because the mean of its divisors is an integer number (9743159125).

Almost surely, 2^38971912321 is an apocalyptic number.

It is an amenable number.

38971912321 is a deficient number, since it is larger than the sum of its proper divisors (724179).

38971912321 is an equidigital number, since it uses as much as digits as its factorization.

38971912321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724178.

The product of its digits is 163296, while the sum is 46.

The spelling of 38971912321 in words is "thirty-eight billion, nine hundred seventy-one million, nine hundred twelve thousand, three hundred twenty-one".