16221336 has 16 divisors (see below), whose sum is σ = 40553400. Its totient is φ = 5407104.

The previous prime is 16221323. The next prime is 16221379. The reversal of 16221336 is 63312261.

It is a happy number.

16221336 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 675889 = 16221336 / (1 + 6 + 2 + 2 + 1 + 3 + 3 + 6).

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337921 + ... + 337968.

Almost surely, 2^16221336 is an apocalyptic number.

It is an amenable number.

16221336 is an abundant number, since it is smaller than the sum of its proper divisors (24332064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16221336 is a wasteful number, since it uses less digits than its factorization.

16221336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675898 (or 675894 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

The square root of 16221336 is about 4027.5719732861. The cubic root of 16221336 is about 253.1408340651.

Adding to 16221336 its reverse (63312261), we get a palindrome (79533597).

The spelling of 16221336 in words is "sixteen million, two hundred twenty-one thousand, three hundred thirty-six".