16012121 has 2 divisors, whose sum is σ = 16012122. Its totient is φ = 16012120.

The previous prime is 16012109. The next prime is 16012153. The reversal of 16012121 is 12121061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14523721 + 1488400 = 3811^2 + 1220^2 .

It is an emirp because it is prime and its reverse (12121061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16012121 - 2¹⁴ = 15995737 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16012096 and 16012105.

It is not a weakly prime, because it can be changed into another prime (16012721) 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, 8006060 + 8006061.

It is an arithmetic number, because the mean of its divisors is an integer number (8006061).

Almost surely, 2^16012121 is an apocalyptic number.

It is an amenable number.

16012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16012121 is an equidigital number, since it uses as much as digits as its factorization.

16012121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 16012121 is about 4001.5148381582. The cubic root of 16012121 is about 252.0478251802.

Adding to 16012121 its reverse (12121061), we get a palindrome (28133182).

The spelling of 16012121 in words is "sixteen million, twelve thousand, one hundred twenty-one".