64222221 has 8 divisors (see below), whose sum is σ = 97862464. Its totient is φ = 36698400.

The previous prime is 64222219. The next prime is 64222229. The reversal of 64222221 is 12222246.

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

It is not a de Polignac number, because 64222221 - 2¹ = 64222219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 3058201 = 64222221 / (6 + 4 + 2 + 2 + 2 + 2 + 2 + 1).

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 (64222229) 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, 1529080 + ... + 1529121.

It is an arithmetic number, because the mean of its divisors is an integer number (12232808).

Almost surely, 2^64222221 is an apocalyptic number.

It is an amenable number.

64222221 is a deficient number, since it is larger than the sum of its proper divisors (33640243).

64222221 is a wasteful number, since it uses less digits than its factorization.

64222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058211.

The product of its digits is 768, while the sum is 21.

The square root of 64222221 is about 8013.8767771909. The cubic root of 64222221 is about 400.4624256170.

Adding to 64222221 its reverse (12222246), we get a palindrome (76444467).

The spelling of 64222221 in words is "sixty-four million, two hundred twenty-two thousand, two hundred twenty-one".