64305221 has 4 divisors (see below), whose sum is σ = 65395200. Its totient is φ = 63215244.

The previous prime is 64305211. The next prime is 64305233. The reversal of 64305221 is 12250346.

64305221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12250346 = 2 ⋅6125173.

It is a cyclic number.

It is not a de Polignac number, because 64305221 - 2¹⁰ = 64304197 is a prime.

It is a super-2 number, since 2×64305221² = 8270322895717682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64305211) 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 in 3 ways as a sum of consecutive naturals, for example, 544901 + ... + 545018.

It is an arithmetic number, because the mean of its divisors is an integer number (16348800).

Almost surely, 2^64305221 is an apocalyptic number.

It is an amenable number.

64305221 is a deficient number, since it is larger than the sum of its proper divisors (1089979).

64305221 is a wasteful number, since it uses less digits than its factorization.

64305221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089978.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 64305221 is about 8019.0536224669. The cubic root of 64305221 is about 400.6348689039.

Adding to 64305221 its reverse (12250346), we get a palindrome (76555567).

The spelling of 64305221 in words is "sixty-four million, three hundred five thousand, two hundred twenty-one".