64264021 has 2 divisors, whose sum is σ = 64264022. Its totient is φ = 64264020.

The previous prime is 64264019. The next prime is 64264027. The reversal of 64264021 is 12046246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 3189796 = 7815^2 + 1786^2 .

It is a cyclic number.

It is not a de Polignac number, because 64264021 - 2¹ = 64264019 is a prime.

Together with 64264019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64264027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32132010 + 32132011.

It is an arithmetic number, because the mean of its divisors is an integer number (32132011).

Almost surely, 2^64264021 is an apocalyptic number.

It is an amenable number.

64264021 is a deficient number, since it is larger than the sum of its proper divisors (1).

64264021 is an equidigital number, since it uses as much as digits as its factorization.

64264021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 64264021 is about 8016.4843291807. The cubic root of 64264021 is about 400.5492891084.

The spelling of 64264021 in words is "sixty-four million, two hundred sixty-four thousand, twenty-one".