3216121 has 2 divisors, whose sum is σ = 3216122. Its totient is φ = 3216120.

The previous prime is 3216119. The next prime is 3216127. The reversal of 3216121 is 1216123.

3216121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2134521 + 1081600 = 1461^2 + 1040^2 .

It is an emirp because it is prime and its reverse (1216123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3216121 - 2¹ = 3216119 is a prime.

Together with 3216119, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

3216121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3216095 and 3216104.

It is not a weakly prime, because it can be changed into another prime (3216127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1608060 + 1608061.

It is an arithmetic number, because the mean of its divisors is an integer number (1608061).

Almost surely, 2^3216121 is an apocalyptic number.

It is an amenable number.

3216121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3216121 is an equidigital number, since it uses as much as digits as its factorization.

3216121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 3216121 is about 1793.3546776921. The cubic root of 3216121 is about 147.6083050191.

The spelling of 3216121 in words is "three million, two hundred sixteen thousand, one hundred twenty-one".