442121 has 2 divisors, whose sum is σ = 442122. Its totient is φ = 442120.

The previous prime is 442109. The next prime is 442139. The reversal of 442121 is 121244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 440896 + 1225 = 664^2 + 35^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 442096 and 442105.

It is not a weakly prime, because it can be changed into another prime (442151) 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, 221060 + 221061.

It is an arithmetic number, because the mean of its divisors is an integer number (221061).

2⁴⁴²¹²¹ is an apocalyptic number.

It is an amenable number.

442121 is a deficient number, since it is larger than the sum of its proper divisors (1).

442121 is an equidigital number, since it uses as much as digits as its factorization.

442121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 14.

The square root of 442121 is about 664.9217999133. The cubic root of 442121 is about 76.1810664284.

Adding to 442121 its reverse (121244), we get a palindrome (563365).

The spelling of 442121 in words is "four hundred forty-two thousand, one hundred twenty-one", and thus it is an iban number.