38971660021 has 16 divisors (see below), whose sum is σ = 44844134400. Its totient is φ = 33176204208.

The previous prime is 38971660001. The next prime is 38971660043. The reversal of 38971660021 is 12006617983.

38971660021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38971660021 - 2²⁹ = 38434789109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38971660021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38971660001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603336 + ... + 664798.

It is an arithmetic number, because the mean of its divisors is an integer number (2802758400).

Almost surely, 2^38971660021 is an apocalyptic number.

It is an amenable number.

38971660021 is a deficient number, since it is larger than the sum of its proper divisors (5872474379).

38971660021 is a wasteful number, since it uses less digits than its factorization.

38971660021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62088.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 38971660021 in words is "thirty-eight billion, nine hundred seventy-one million, six hundred sixty thousand, twenty-one".