65441021 has 2 divisors, whose sum is σ = 65441022. Its totient is φ = 65441020.

The previous prime is 65440987. The next prime is 65441027. The reversal of 65441021 is 12014456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53085796 + 12355225 = 7286^2 + 3515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65441021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65441027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32720510 + 32720511.

It is an arithmetic number, because the mean of its divisors is an integer number (32720511).

Almost surely, 2^65441021 is an apocalyptic number.

It is an amenable number.

65441021 is a deficient number, since it is larger than the sum of its proper divisors (1).

65441021 is an equidigital number, since it uses as much as digits as its factorization.

65441021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 65441021 is about 8089.5624727175. The cubic root of 65441021 is about 402.9798728524.

Adding to 65441021 its reverse (12014456), we get a palindrome (77455477).

The spelling of 65441021 in words is "sixty-five million, four hundred forty-one thousand, twenty-one".