16244021 has 2 divisors, whose sum is σ = 16244022. Its totient is φ = 16244020.

The previous prime is 16244017. The next prime is 16244047. The reversal of 16244021 is 12044261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10048900 + 6195121 = 3170^2 + 2489^2 .

It is a cyclic number.

It is not a de Polignac number, because 16244021 - 2² = 16244017 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16243984 and 16244002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16243021) 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, 8122010 + 8122011.

It is an arithmetic number, because the mean of its divisors is an integer number (8122011).

Almost surely, 2^16244021 is an apocalyptic number.

It is an amenable number.

16244021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16244021 is an equidigital number, since it uses as much as digits as its factorization.

16244021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 16244021 is about 4030.3872022425. The cubic root of 16244021 is about 253.2587821182.

Adding to 16244021 its reverse (12044261), we get a palindrome (28288282).

The spelling of 16244021 in words is "sixteen million, two hundred forty-four thousand, twenty-one".