64332221 has 4 divisors (see below), whose sum is σ = 65107392. Its totient is φ = 63557052.

The previous prime is 64332211. The next prime is 64332227. The reversal of 64332221 is 12223346.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64332221 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64332227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387461 + ... + 387626.

It is an arithmetic number, because the mean of its divisors is an integer number (16276848).

Almost surely, 2^64332221 is an apocalyptic number.

It is an amenable number.

64332221 is a deficient number, since it is larger than the sum of its proper divisors (775171).

64332221 is an equidigital number, since it uses as much as digits as its factorization.

64332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775170.

The product of its digits is 1728, while the sum is 23.

The square root of 64332221 is about 8020.7369362173. The cubic root of 64332221 is about 400.6909329254.

Adding to 64332221 its reverse (12223346), we get a palindrome (76555567).

The spelling of 64332221 in words is "sixty-four million, three hundred thirty-two thousand, two hundred twenty-one".