16821696 has 28 divisors (see below), whose sum is σ = 44507912. Its totient is φ = 5607168.

The previous prime is 16821691. The next prime is 16821703. The reversal of 16821696 is 69612861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43615 + ... + 43998.

Almost surely, 2^16821696 is an apocalyptic number.

16821696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16821696 is an abundant number, since it is smaller than the sum of its proper divisors (27686216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16821696 is an equidigital number, since it uses as much as digits as its factorization.

16821696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87628 (or 87618 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 16821696 is about 4101.4260934460. The cubic root of 16821696 is about 256.2260373389.

The spelling of 16821696 in words is "sixteen million, eight hundred twenty-one thousand, six hundred ninety-six".