16622321 has 4 divisors (see below), whose sum is σ = 17497200. Its totient is φ = 15747444.

The previous prime is 16622303. The next prime is 16622329. The reversal of 16622321 is 12322661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16622321 - 2⁶ = 16622257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16622329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437411 + ... + 437448.

It is an arithmetic number, because the mean of its divisors is an integer number (4374300).

Almost surely, 2^16622321 is an apocalyptic number.

It is an amenable number.

16622321 is a deficient number, since it is larger than the sum of its proper divisors (874879).

16622321 is an equidigital number, since it uses as much as digits as its factorization.

16622321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874878.

The product of its digits is 864, while the sum is 23.

The square root of 16622321 is about 4077.0480742812. The cubic root of 16622321 is about 255.2097262191.

Adding to 16622321 its reverse (12322661), we get a palindrome (28944982).

The spelling of 16622321 in words is "sixteen million, six hundred twenty-two thousand, three hundred twenty-one".