64004821 has 2 divisors, whose sum is σ = 64004822. Its totient is φ = 64004820.

The previous prime is 64004803. The next prime is 64004833. The reversal of 64004821 is 12840046.

64004821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59120721 + 4884100 = 7689^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 64004821 - 2⁹ = 64004309 is a prime.

It is a super-2 number, since 2×64004821² = 8193234222484082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64004861) 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, 32002410 + 32002411.

It is an arithmetic number, because the mean of its divisors is an integer number (32002411).

Almost surely, 2^64004821 is an apocalyptic number.

It is an amenable number.

64004821 is a deficient number, since it is larger than the sum of its proper divisors (1).

64004821 is an equidigital number, since it uses as much as digits as its factorization.

64004821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 64004821 is about 8000.3013068259. The cubic root of 64004821 is about 400.0100434978.

Adding to 64004821 its reverse (12840046), we get a palindrome (76844867).

The spelling of 64004821 in words is "sixty-four million, four thousand, eight hundred twenty-one".