16821104 has 10 divisors (see below), whose sum is σ = 32590920. Its totient is φ = 8410544.

The previous prime is 16821083. The next prime is 16821121. The reversal of 16821104 is 40112861.

It is a self number, because there is not a number n which added to its sum of digits gives 16821104.

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, 525644 + ... + 525675.

It is an arithmetic number, because the mean of its divisors is an integer number (3259092).

Almost surely, 2^16821104 is an apocalyptic number.

It is an amenable number.

16821104 is a deficient number, since it is larger than the sum of its proper divisors (15769816).

16821104 is a wasteful number, since it uses less digits than its factorization.

16821104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051327 (or 1051321 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 16821104 is about 4101.3539227918. The cubic root of 16821104 is about 256.2230315462.

Adding to 16821104 its reverse (40112861), we get a palindrome (56933965).

The spelling of 16821104 in words is "sixteen million, eight hundred twenty-one thousand, one hundred four".