65043421 has 2 divisors, whose sum is σ = 65043422. Its totient is φ = 65043420.

The previous prime is 65043413. The next prime is 65043437. The reversal of 65043421 is 12434056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40896025 + 24147396 = 6395^2 + 4914^2 .

It is a cyclic number.

It is not a de Polignac number, because 65043421 - 2³ = 65043413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65043721) 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, 32521710 + 32521711.

It is an arithmetic number, because the mean of its divisors is an integer number (32521711).

Almost surely, 2^65043421 is an apocalyptic number.

It is an amenable number.

65043421 is a deficient number, since it is larger than the sum of its proper divisors (1).

65043421 is an equidigital number, since it uses as much as digits as its factorization.

65043421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 65043421 is about 8064.9501548367. The cubic root of 65043421 is about 402.1620861526.

Adding to 65043421 its reverse (12434056), we get a palindrome (77477477).

The spelling of 65043421 in words is "sixty-five million, forty-three thousand, four hundred twenty-one".