18038221922 has 18 divisors (see below), whose sum is σ = 31477176747. Its totient is φ = 7730096724.

The previous prime is 18038221921. The next prime is 18038221933. The reversal of 18038221922 is 22912283081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9019110961 + 9019110961 = 94969^2 + 94969^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=94969.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18038221921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1322783 + ... + 1336349.

Almost surely, 2^18038221922 is an apocalyptic number.

18038221922 is a deficient number, since it is larger than the sum of its proper divisors (13438954825).

18038221922 is an frugal number, since it uses more digits than its factorization.

18038221922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27150 (or 13576 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 18038221922 in words is "eighteen billion, thirty-eight million, two hundred twenty-one thousand, nine hundred twenty-two".