216045221 has 8 divisors (see below), whose sum is σ = 248080704. Its totient is φ = 184302720.

The previous prime is 216045211. The next prime is 216045227. The reversal of 216045221 is 122540612.

It is a happy number.

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

It is not a de Polignac number, because 216045221 - 2¹⁰ = 216044197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216045227) 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 7 ways as a sum of consecutive naturals, for example, 71660 + ... + 74613.

It is an arithmetic number, because the mean of its divisors is an integer number (31010088).

Almost surely, 2^216045221 is an apocalyptic number.

It is an amenable number.

216045221 is a deficient number, since it is larger than the sum of its proper divisors (32035483).

216045221 is a wasteful number, since it uses less digits than its factorization.

216045221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146491.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 216045221 is about 14698.4768258483. The cubic root of 216045221 is about 600.0418683746.

Adding to 216045221 its reverse (122540612), we get a palindrome (338585833).

The spelling of 216045221 in words is "two hundred sixteen million, forty-five thousand, two hundred twenty-one".