64221 has 4 divisors (see below), whose sum is σ = 85632. Its totient is φ = 42812.

The previous prime is 64217. The next prime is 64223. The reversal of 64221 is 12246.

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 not a de Polignac number, because 64221 - 2² = 64217 is a prime.

It is a D-number.

64221 is a lucky number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 64221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64223) 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, 10701 + ... + 10706.

It is an arithmetic number, because the mean of its divisors is an integer number (21408).

2⁶⁴²²¹ is an apocalyptic number.

It is an amenable number.

64221 is a deficient number, since it is larger than the sum of its proper divisors (21411).

64221 is a wasteful number, since it uses less digits than its factorization.

64221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21410.

The product of its digits is 96, while the sum is 15.

The square root of 64221 is about 253.4186259926. The cubic root of 64221 is about 40.0459887722.

Adding to 64221 its reverse (12246), we get a palindrome (76467).

The spelling of 64221 in words is "sixty-four thousand, two hundred twenty-one".