38221906891 has 8 divisors (see below), whose sum is σ = 43684583904. Its totient is φ = 32759831040.

The previous prime is 38221906859. The next prime is 38221907029. The reversal of 38221906891 is 19860912283.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 38221906891 - 2⁵ = 38221906859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38221906831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4630 + ... + 276523.

It is an arithmetic number, because the mean of its divisors is an integer number (5460572988).

Almost surely, 2^38221906891 is an apocalyptic number.

38221906891 is a deficient number, since it is larger than the sum of its proper divisors (5462677013).

38221906891 is a wasteful number, since it uses less digits than its factorization.

38221906891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300581.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 38221906891 in words is "thirty-eight billion, two hundred twenty-one million, nine hundred six thousand, eight hundred ninety-one".