16448221 has 4 divisors (see below), whose sum is σ = 16492000. Its totient is φ = 16404444.

The previous prime is 16448213. The next prime is 16448227. The reversal of 16448221 is 12284461.

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 16448221 - 2³ = 16448213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16448221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16448227) 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, 21321 + ... + 22078.

It is an arithmetic number, because the mean of its divisors is an integer number (4123000).

Almost surely, 2^16448221 is an apocalyptic number.

It is an amenable number.

16448221 is a deficient number, since it is larger than the sum of its proper divisors (43779).

16448221 is an equidigital number, since it uses as much as digits as its factorization.

16448221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43778.

The product of its digits is 3072, while the sum is 28.

The square root of 16448221 is about 4055.6406398990. The cubic root of 16448221 is about 254.3155861980.

The spelling of 16448221 in words is "sixteen million, four hundred forty-eight thousand, two hundred twenty-one".