16042021 has 2 divisors, whose sum is σ = 16042022. Its totient is φ = 16042020.

The previous prime is 16042007. The next prime is 16042031. The reversal of 16042021 is 12024061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 3189796 = 3585^2 + 1786^2 .

It is a cyclic number.

It is not a de Polignac number, because 16042021 - 2⁵ = 16041989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16041986 and 16042004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16042001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8021010 + 8021011.

It is an arithmetic number, because the mean of its divisors is an integer number (8021011).

Almost surely, 2^16042021 is an apocalyptic number.

It is an amenable number.

16042021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16042021 is an equidigital number, since it uses as much as digits as its factorization.

16042021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 16042021 is about 4005.2491807627. The cubic root of 16042021 is about 252.2046135687.

Adding to 16042021 its reverse (12024061), we get a palindrome (28066082).

The spelling of 16042021 in words is "sixteen million, forty-two thousand, twenty-one".