16221443 has 4 divisors (see below), whose sum is σ = 18538800. Its totient is φ = 13904088.

The previous prime is 16221433. The next prime is 16221467. The reversal of 16221443 is 34412261.

16221443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34412261 = 13 ⋅2647097.

It is a cyclic number.

It is not a de Polignac number, because 16221443 - 2⁶ = 16221379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16221433) 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, 1158668 + ... + 1158681.

It is an arithmetic number, because the mean of its divisors is an integer number (4634700).

Almost surely, 2^16221443 is an apocalyptic number.

16221443 is a deficient number, since it is larger than the sum of its proper divisors (2317357).

16221443 is an equidigital number, since it uses as much as digits as its factorization.

16221443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317356.

The product of its digits is 1152, while the sum is 23.

The square root of 16221443 is about 4027.5852567016. The cubic root of 16221443 is about 253.1413906574.

The spelling of 16221443 in words is "sixteen million, two hundred twenty-one thousand, four hundred forty-three".