16459021 has 2 divisors, whose sum is σ = 16459022. Its totient is φ = 16459020.

The previous prime is 16458989. The next prime is 16459039. The reversal of 16459021 is 12095461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14356521 + 2102500 = 3789^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 16459021 - 2⁵ = 16458989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16459721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8229510 + 8229511.

It is an arithmetic number, because the mean of its divisors is an integer number (8229511).

Almost surely, 2^16459021 is an apocalyptic number.

It is an amenable number.

16459021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16459021 is an equidigital number, since it uses as much as digits as its factorization.

16459021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 16459021 is about 4056.9719003217. The cubic root of 16459021 is about 254.3712357300.

The spelling of 16459021 in words is "sixteen million, four hundred fifty-nine thousand, twenty-one".