18221570389 has 8 divisors (see below), whose sum is σ = 20301015168. Its totient is φ = 16212615360.

The previous prime is 18221570387. The next prime is 18221570459. The reversal of 18221570389 is 98307512281.

It is a happy number.

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 18221570389 - 2¹ = 18221570387 is a prime.

It is a super-2 number, since 2×18221570389² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221570387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17621892 + ... + 17622925.

It is an arithmetic number, because the mean of its divisors is an integer number (2537626896).

Almost surely, 2^18221570389 is an apocalyptic number.

It is an amenable number.

18221570389 is a deficient number, since it is larger than the sum of its proper divisors (2079444779).

18221570389 is a wasteful number, since it uses less digits than its factorization.

18221570389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35244875.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 18221570389 in words is "eighteen billion, two hundred twenty-one million, five hundred seventy thousand, three hundred eighty-nine".