16921312 has 12 divisors (see below), whose sum is σ = 33313896. Its totient is φ = 8460640.

The previous prime is 16921309. The next prime is 16921337. The reversal of 16921312 is 21312961.

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, 264364 + ... + 264427.

It is an arithmetic number, because the mean of its divisors is an integer number (2776158).

Almost surely, 2^16921312 is an apocalyptic number.

It is an amenable number.

16921312 is a deficient number, since it is larger than the sum of its proper divisors (16392584).

16921312 is an equidigital number, since it uses as much as digits as its factorization.

16921312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528801 (or 528793 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

The square root of 16921312 is about 4113.5522362066. The cubic root of 16921312 is about 256.7308218406.

The spelling of 16921312 in words is "sixteen million, nine hundred twenty-one thousand, three hundred twelve".