16338121 has 2 divisors, whose sum is σ = 16338122. Its totient is φ = 16338120.

The previous prime is 16338109. The next prime is 16338137. The reversal of 16338121 is 12183361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 250000 = 4011^2 + 500^2 .

It is an emirp because it is prime and its reverse (12183361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16338121 - 2⁵ = 16338089 is a prime.

It is not a weakly prime, because it can be changed into another prime (16338181) 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, 8169060 + 8169061.

It is an arithmetic number, because the mean of its divisors is an integer number (8169061).

Almost surely, 2^16338121 is an apocalyptic number.

It is an amenable number.

16338121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16338121 is an equidigital number, since it uses as much as digits as its factorization.

16338121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 16338121 is about 4042.0441610650. The cubic root of 16338121 is about 253.7468751587.

The spelling of 16338121 in words is "sixteen million, three hundred thirty-eight thousand, one hundred twenty-one".