216334221 has 8 divisors (see below), whose sum is σ = 288724800. Its totient is φ = 144083232.

The previous prime is 216334219. The next prime is 216334249. The reversal of 216334221 is 122433612.

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

It is not a de Polignac number, because 216334221 - 2¹ = 216334219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216334191 and 216334200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216330221) 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, 31225 + ... + 37518.

It is an arithmetic number, because the mean of its divisors is an integer number (36090600).

Almost surely, 2^216334221 is an apocalyptic number.

It is an amenable number.

216334221 is a deficient number, since it is larger than the sum of its proper divisors (72390579).

216334221 is a wasteful number, since it uses less digits than its factorization.

216334221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69795.

The product of its digits is 1728, while the sum is 24.

The square root of 216334221 is about 14708.3044910010. The cubic root of 216334221 is about 600.3093044128.

Adding to 216334221 its reverse (122433612), we get a palindrome (338767833).

The spelling of 216334221 in words is "two hundred sixteen million, three hundred thirty-four thousand, two hundred twenty-one".