16828621 has 2 divisors, whose sum is σ = 16828622. Its totient is φ = 16828620.

The previous prime is 16828607. The next prime is 16828631. The reversal of 16828621 is 12682861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 133225 = 4086^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 16828621 - 2⁹ = 16828109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16828631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8414310 + 8414311.

It is an arithmetic number, because the mean of its divisors is an integer number (8414311).

Almost surely, 2^16828621 is an apocalyptic number.

It is an amenable number.

16828621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16828621 is an equidigital number, since it uses as much as digits as its factorization.

16828621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 34.

The square root of 16828621 is about 4102.2702251314. The cubic root of 16828621 is about 256.2611927691.

Subtracting from 16828621 its reverse (12682861), we obtain a triangular number (4145760 = T₂₈₇₉).

The spelling of 16828621 in words is "sixteen million, eight hundred twenty-eight thousand, six hundred twenty-one".