16994921 has 4 divisors (see below), whose sum is σ = 17009232. Its totient is φ = 16980612.

The previous prime is 16994909. The next prime is 16994941. The reversal of 16994921 is 12949961.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12949961 = 67 ⋅193283.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16994921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16994941) 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, 5195 + ... + 7808.

It is an arithmetic number, because the mean of its divisors is an integer number (4252308).

Almost surely, 2^16994921 is an apocalyptic number.

It is an amenable number.

16994921 is a deficient number, since it is larger than the sum of its proper divisors (14311).

16994921 is a wasteful number, since it uses less digits than its factorization.

16994921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14310.

The product of its digits is 34992, while the sum is 41.

The square root of 16994921 is about 4122.4896603873. The cubic root of 16994921 is about 257.1025495756.

The spelling of 16994921 in words is "sixteen million, nine hundred ninety-four thousand, nine hundred twenty-one".