64227221 has 2 divisors, whose sum is σ = 64227222. Its totient is φ = 64227220.

The previous prime is 64227217. The next prime is 64227263. The reversal of 64227221 is 12272246.

64227221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 3025 = 8014^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 64227221 - 2² = 64227217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64227211) 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, 32113610 + 32113611.

It is an arithmetic number, because the mean of its divisors is an integer number (32113611).

Almost surely, 2^64227221 is an apocalyptic number.

It is an amenable number.

64227221 is a deficient number, since it is larger than the sum of its proper divisors (1).

64227221 is an equidigital number, since it uses as much as digits as its factorization.

64227221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 26.

The square root of 64227221 is about 8014.1887299963. The cubic root of 64227221 is about 400.4728179710.

Adding to 64227221 its reverse (12272246), we get a palindrome (76499467).

The spelling of 64227221 in words is "sixty-four million, two hundred twenty-seven thousand, two hundred twenty-one".