28064000221 has 2 divisors, whose sum is σ = 28064000222. Its totient is φ = 28064000220.

The previous prime is 28064000219. The next prime is 28064000243. The reversal of 28064000221 is 12200046082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14575732900 + 13488267321 = 120730^2 + 116139^2 .

It is a cyclic number.

It is not a de Polignac number, because 28064000221 - 2¹ = 28064000219 is a prime.

Together with 28064000219, 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 (28064000291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14032000110 + 14032000111.

It is an arithmetic number, because the mean of its divisors is an integer number (14032000111).

Almost surely, 2^28064000221 is an apocalyptic number.

It is an amenable number.

28064000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

28064000221 is an equidigital number, since it uses as much as digits as its factorization.

28064000221 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 spelling of 28064000221 in words is "twenty-eight billion, sixty-four million, two hundred twenty-one", and thus it is an aban number.