38866858021 has 4 divisors (see below), whose sum is σ = 38898795852. Its totient is φ = 38834920192.

The previous prime is 38866858013. The next prime is 38866858081. The reversal of 38866858021 is 12085866883.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8838820225 + 30028037796 = 94015^2 + 173286^2 .

It is a cyclic number.

It is not a de Polignac number, because 38866858021 - 2³ = 38866858013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38866858081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15967090 + ... + 15969523.

It is an arithmetic number, because the mean of its divisors is an integer number (9724698963).

Almost surely, 2^38866858021 is an apocalyptic number.

It is an amenable number.

38866858021 is a deficient number, since it is larger than the sum of its proper divisors (31937831).

38866858021 is a wasteful number, since it uses less digits than its factorization.

38866858021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31937830.

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 38866858021 in words is "thirty-eight billion, eight hundred sixty-six million, eight hundred fifty-eight thousand, twenty-one".