16694021 has 4 divisors (see below), whose sum is σ = 17419872. Its totient is φ = 15968172.

The previous prime is 16694009. The next prime is 16694047. The reversal of 16694021 is 12049661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16694021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16694081) 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, 362891 + ... + 362936.

It is an arithmetic number, because the mean of its divisors is an integer number (4354968).

Almost surely, 2^16694021 is an apocalyptic number.

It is an amenable number.

16694021 is a deficient number, since it is larger than the sum of its proper divisors (725851).

16694021 is an equidigital number, since it uses as much as digits as its factorization.

16694021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725850.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 16694021 is about 4085.8317390710. The cubic root of 16694021 is about 255.5761469720.

The spelling of 16694021 in words is "sixteen million, six hundred ninety-four thousand, twenty-one".