16921004 has 12 divisors (see below), whose sum is σ = 30029328. Its totient is φ = 8341200.

The previous prime is 16920983. The next prime is 16921013. The reversal of 16921004 is 40012961.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29507 + ... + 30074.

It is an arithmetic number, because the mean of its divisors is an integer number (2502444).

Almost surely, 2^16921004 is an apocalyptic number.

It is an amenable number.

16921004 is a deficient number, since it is larger than the sum of its proper divisors (13108324).

16921004 is a wasteful number, since it uses less digits than its factorization.

16921004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59656 (or 59654 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16921004 is about 4113.5147988065. The cubic root of 16921004 is about 256.7292641684.

Adding to 16921004 its reverse (40012961), we get a palindrome (56933965).

The spelling of 16921004 in words is "sixteen million, nine hundred twenty-one thousand, four".