16221446 has 4 divisors (see below), whose sum is σ = 24332172. Its totient is φ = 8110722.

The previous prime is 16221433. The next prime is 16221467. The reversal of 16221446 is 64412261.

16221446 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: 64412261 = 19 ⋅3390119.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4055360 + ... + 4055363.

It is an arithmetic number, because the mean of its divisors is an integer number (6083043).

Almost surely, 2^16221446 is an apocalyptic number.

16221446 is a deficient number, since it is larger than the sum of its proper divisors (8110726).

16221446 is an equidigital number, since it uses as much as digits as its factorization.

16221446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110725.

The product of its digits is 2304, while the sum is 26.

The square root of 16221446 is about 4027.5856291332. The cubic root of 16221446 is about 253.1414062627.

The spelling of 16221446 in words is "sixteen million, two hundred twenty-one thousand, four hundred forty-six".