16452221 has 2 divisors, whose sum is σ = 16452222. Its totient is φ = 16452220.

The previous prime is 16452217. The next prime is 16452239. The reversal of 16452221 is 12225461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 6180196 = 3205^2 + 2486^2 .

It is an emirp because it is prime and its reverse (12225461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16452221 - 2² = 16452217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16452281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8226110 + 8226111.

It is an arithmetic number, because the mean of its divisors is an integer number (8226111).

Almost surely, 2^16452221 is an apocalyptic number.

It is an amenable number.

16452221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16452221 is an equidigital number, since it uses as much as digits as its factorization.

16452221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 16452221 is about 4056.1337502602. The cubic root of 16452221 is about 254.3361999753.

Adding to 16452221 its reverse (12225461), we get a palindrome (28677682).

The spelling of 16452221 in words is "sixteen million, four hundred fifty-two thousand, two hundred twenty-one".