16814921 has 8 divisors (see below), whose sum is σ = 17875080. Its totient is φ = 15762688.

The previous prime is 16814891. The next prime is 16814929. The reversal of 16814921 is 12941861.

It can be written as a sum of positive squares in 4 ways, for example, as 3013696 + 13801225 = 1736^2 + 3715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16814921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16814929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2735 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (2234385).

Almost surely, 2^16814921 is an apocalyptic number.

It is an amenable number.

16814921 is a deficient number, since it is larger than the sum of its proper divisors (1060159).

16814921 is a wasteful number, since it uses less digits than its factorization.

16814921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963.

The product of its digits is 3456, while the sum is 32.

The square root of 16814921 is about 4100.6000780374. The cubic root of 16814921 is about 256.1916340598.

The spelling of 16814921 in words is "sixteen million, eight hundred fourteen thousand, nine hundred twenty-one".