16422331221 has 6 divisors (see below), whose sum is σ = 23721145110. Its totient is φ = 10948220808.

The previous prime is 16422331181. The next prime is 16422331229. The reversal of 16422331221 is 12213322461.

16422331221 is a `hidden beast` number, since 1 + 642 + 2 + 3 + 3 + 12 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10780668900 + 5641662321 = 103830^2 + 75111^2 .

It is not a de Polignac number, because 16422331221 - 2⁶ = 16422331157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16422331229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 912351726 + ... + 912351743.

It is an arithmetic number, because the mean of its divisors is an integer number (3953524185).

Almost surely, 2^16422331221 is an apocalyptic number.

It is an amenable number.

16422331221 is a deficient number, since it is larger than the sum of its proper divisors (7298813889).

16422331221 is a wasteful number, since it uses less digits than its factorization.

16422331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824703475 (or 1824703472 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 16422331221 its reverse (12213322461), we get a palindrome (28635653682).

The spelling of 16422331221 in words is "sixteen billion, four hundred twenty-two million, three hundred thirty-one thousand, two hundred twenty-one".