64802021 has 2 divisors, whose sum is σ = 64802022. Its totient is φ = 64802020.

The previous prime is 64801999. The next prime is 64802033. The reversal of 64802021 is 12020846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60450625 + 4351396 = 7775^2 + 2086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64802021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64802071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32401010 + 32401011.

It is an arithmetic number, because the mean of its divisors is an integer number (32401011).

Almost surely, 2^64802021 is an apocalyptic number.

It is an amenable number.

64802021 is a deficient number, since it is larger than the sum of its proper divisors (1).

64802021 is an equidigital number, since it uses as much as digits as its factorization.

64802021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 64802021 is about 8049.9702483922. The cubic root of 64802021 is about 401.6639456972.

Adding to 64802021 its reverse (12020846), we get a palindrome (76822867).

The spelling of 64802021 in words is "sixty-four million, eight hundred two thousand, twenty-one".