38963818921 has 4 divisors (see below), whose sum is σ = 38971111312. Its totient is φ = 38956526532.

The previous prime is 38963818849. The next prime is 38963818969. The reversal of 38963818921 is 12981836983.

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 38963818921 - 2⁷ = 38963818793 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38963818981) 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, 3638175 + ... + 3648868.

It is an arithmetic number, because the mean of its divisors is an integer number (9742777828).

Almost surely, 2^38963818921 is an apocalyptic number.

It is an amenable number.

38963818921 is a deficient number, since it is larger than the sum of its proper divisors (7292391).

38963818921 is an equidigital number, since it uses as much as digits as its factorization.

38963818921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7292390.

The product of its digits is 4478976, while the sum is 58.

The spelling of 38963818921 in words is "thirty-eight billion, nine hundred sixty-three million, eight hundred eighteen thousand, nine hundred twenty-one".