64422409021 has 2 divisors, whose sum is σ = 64422409022. Its totient is φ = 64422409020.

The previous prime is 64422409019. The next prime is 64422409043. The reversal of 64422409021 is 12090422446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35641286521 + 28781122500 = 188789^2 + 169650^2 .

It is a cyclic number.

It is not a de Polignac number, because 64422409021 - 2¹ = 64422409019 is a prime.

Together with 64422409019, 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 (64422409081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32211204510 + 32211204511.

It is an arithmetic number, because the mean of its divisors is an integer number (32211204511).

Almost surely, 2^64422409021 is an apocalyptic number.

It is an amenable number.

64422409021 is a deficient number, since it is larger than the sum of its proper divisors (1).

64422409021 is an equidigital number, since it uses as much as digits as its factorization.

64422409021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 64422409021 in words is "sixty-four billion, four hundred twenty-two million, four hundred nine thousand, twenty-one".