216321242 has 8 divisors (see below), whose sum is σ = 324767232. Its totient is φ = 108065500.

The previous prime is 216321229. The next prime is 216321257. The reversal of 216321242 is 242123612.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44684 + ... + 49287.

It is an arithmetic number, because the mean of its divisors is an integer number (40595904).

Almost surely, 2^216321242 is an apocalyptic number.

216321242 is a deficient number, since it is larger than the sum of its proper divisors (108445990).

216321242 is a wasteful number, since it uses less digits than its factorization.

216321242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95124.

The product of its digits is 1152, while the sum is 23.

The square root of 216321242 is about 14707.8632710533. The cubic root of 216321242 is about 600.2972989608.

Adding to 216321242 its reverse (242123612), we get a palindrome (458444854).

The spelling of 216321242 in words is "two hundred sixteen million, three hundred twenty-one thousand, two hundred forty-two".