16450221 has 16 divisors (see below), whose sum is σ = 23679360. Its totient is φ = 10127040.

The previous prime is 16450211. The next prime is 16450261. The reversal of 16450221 is 12205461.

It is not a de Polignac number, because 16450221 - 2⁹ = 16449709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16450211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2110 + ... + 6111.

It is an arithmetic number, because the mean of its divisors is an integer number (1479960).

Almost surely, 2^16450221 is an apocalyptic number.

It is an amenable number.

16450221 is a deficient number, since it is larger than the sum of its proper divisors (7229139).

16450221 is a wasteful number, since it uses less digits than its factorization.

16450221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8276.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 16450221 is about 4055.8872025736. The cubic root of 16450221 is about 254.3258935043.

Adding to 16450221 its reverse (12205461), we get a palindrome (28655682).

The spelling of 16450221 in words is "sixteen million, four hundred fifty thousand, two hundred twenty-one".