16448821 has 2 divisors, whose sum is σ = 16448822. Its totient is φ = 16448820.

The previous prime is 16448779. The next prime is 16448849. The reversal of 16448821 is 12884461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 4100625 = 3514^2 + 2025^2 .

It is an emirp because it is prime and its reverse (12884461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16448821 - 2¹³ = 16440629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16442821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8224410 + 8224411.

It is an arithmetic number, because the mean of its divisors is an integer number (8224411).

Almost surely, 2^16448821 is an apocalyptic number.

It is an amenable number.

16448821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16448821 is an equidigital number, since it uses as much as digits as its factorization.

16448821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 34.

The square root of 16448821 is about 4055.7146102752. The cubic root of 16448821 is about 254.3186784776.

The spelling of 16448821 in words is "sixteen million, four hundred forty-eight thousand, eight hundred twenty-one".