16721104 has 20 divisors (see below), whose sum is σ = 32703264. Its totient is φ = 8281568.

The previous prime is 16721093. The next prime is 16721119. The reversal of 16721104 is 40112761.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3172 + ... + 6595.

Almost surely, 2^16721104 is an apocalyptic number.

It is an amenable number.

16721104 is a deficient number, since it is larger than the sum of its proper divisors (15982160).

16721104 is a wasteful number, since it uses less digits than its factorization.

16721104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9882 (or 9876 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 16721104 is about 4089.1446538365. The cubic root of 16721104 is about 255.7142808396.

Adding to 16721104 its reverse (40112761), we get a palindrome (56833865).

The spelling of 16721104 in words is "sixteen million, seven hundred twenty-one thousand, one hundred four".