16333921 has 2 divisors, whose sum is σ = 16333922. Its totient is φ = 16333920.

The previous prime is 16333913. The next prime is 16333943. The reversal of 16333921 is 12933361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 12321 = 4040^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 16333921 - 2³ = 16333913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16333921.

It is not a weakly prime, because it can be changed into another prime (16333951) 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, 8166960 + 8166961.

It is an arithmetic number, because the mean of its divisors is an integer number (8166961).

Almost surely, 2^16333921 is an apocalyptic number.

It is an amenable number.

16333921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16333921 is an equidigital number, since it uses as much as digits as its factorization.

16333921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 28.

The square root of 16333921 is about 4041.5245885680. The cubic root of 16333921 is about 253.7251299366.

The spelling of 16333921 in words is "sixteen million, three hundred thirty-three thousand, nine hundred twenty-one".