64217321 has 8 divisors (see below), whose sum is σ = 77254080. Its totient is φ = 52146288.

The previous prime is 64217317. The next prime is 64217341. The reversal of 64217321 is 12371246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64217321 - 2² = 64217317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64217341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241286 + ... + 241551.

It is an arithmetic number, because the mean of its divisors is an integer number (9656760).

Almost surely, 2^64217321 is an apocalyptic number.

It is an amenable number.

64217321 is a deficient number, since it is larger than the sum of its proper divisors (13036759).

64217321 is a wasteful number, since it uses less digits than its factorization.

64217321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482863.

The product of its digits is 2016, while the sum is 26.

The square root of 64217321 is about 8013.5710516598. The cubic root of 64217321 is about 400.4522405868.

Adding to 64217321 its reverse (12371246), we get a palindrome (76588567).

The spelling of 64217321 in words is "sixty-four million, two hundred seventeen thousand, three hundred twenty-one".