16424221 has 8 divisors (see below), whose sum is σ = 17978688. Its totient is φ = 14880000.

The previous prime is 16424209. The next prime is 16424249. The reversal of 16424221 is 12242461.

It is a happy number.

It is the 1655-th star number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16424221 - 2⁹ = 16423709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16424192 and 16424201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16424201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1021 + ... + 5821.

It is an arithmetic number, because the mean of its divisors is an integer number (2247336).

Almost surely, 2^16424221 is an apocalyptic number.

16424221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16424221 is a deficient number, since it is larger than the sum of its proper divisors (1554467).

16424221 is a wasteful number, since it uses less digits than its factorization.

16424221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123.

The product of its digits is 768, while the sum is 22.

The square root of 16424221 is about 4052.6807177472. The cubic root of 16424221 is about 254.1918332989.

Adding to 16424221 its reverse (12242461), we get a palindrome (28666682).

The spelling of 16424221 in words is "sixteen million, four hundred twenty-four thousand, two hundred twenty-one".