16303221 has 32 divisors (see below), whose sum is σ = 27907200. Its totient is φ = 9296640.

The previous prime is 16303211. The next prime is 16303229. The reversal of 16303221 is 12230361.

16303221 is a `hidden beast` number, since 1 + 630 + 32 + 2 + 1 = 666.

It is not a de Polignac number, because 16303221 - 2⁹ = 16302709 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 16303194 and 16303203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16303229) 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 31 ways as a sum of consecutive naturals, for example, 3435 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (872100).

Almost surely, 2^16303221 is an apocalyptic number.

16303221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16303221 is a deficient number, since it is larger than the sum of its proper divisors (11603979).

16303221 is a wasteful number, since it uses less digits than its factorization.

16303221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266 (or 3260 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 16303221 is about 4037.7247305878. The cubic root of 16303221 is about 253.5660694005.

Adding to 16303221 its reverse (12230361), we get a palindrome (28533582).

It can be divided in two parts, 1630 and 3221, that added together give a triangular number (4851 = T₉₈).

The spelling of 16303221 in words is "sixteen million, three hundred three thousand, two hundred twenty-one".