16453321 has 2 divisors, whose sum is σ = 16453322. Its totient is φ = 16453320.

The previous prime is 16453319. The next prime is 16453357. The reversal of 16453321 is 12335461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 164025 = 4036^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 16453321 - 2¹ = 16453319 is a prime.

It is a super-4 number, since 4×16453321⁴ (a number of 30 digits) contains 4444 as substring.

Together with 16453319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16453361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8226660 + 8226661.

It is an arithmetic number, because the mean of its divisors is an integer number (8226661).

Almost surely, 2^16453321 is an apocalyptic number.

It is an amenable number.

16453321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16453321 is an equidigital number, since it uses as much as digits as its factorization.

16453321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 16453321 is about 4056.2693451002. The cubic root of 16453321 is about 254.3418681783.

Adding to 16453321 its reverse (12335461), we get a palindrome (28788782).

The spelling of 16453321 in words is "sixteen million, four hundred fifty-three thousand, three hundred twenty-one".