216244242 has 96 divisors (see below), whose sum is σ = 512366400. Its totient is φ = 68257728.

The previous prime is 216244211. The next prime is 216244247. The reversal of 216244242 is 242442612.

216244242 is a `hidden beast` number, since 216 + 2 + 442 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (216244247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 944184 + ... + 944412.

It is an arithmetic number, because the mean of its divisors is an integer number (5337150).

Almost surely, 2^216244242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216244242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256183200).

216244242 is an abundant number, since it is smaller than the sum of its proper divisors (296122158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216244242 is a wasteful number, since it uses less digits than its factorization.

216244242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 330 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 216244242 is about 14705.2453906761. The cubic root of 216244242 is about 600.2260648138.

Adding to 216244242 its reverse (242442612), we get a palindrome (458686854).

The spelling of 216244242 in words is "two hundred sixteen million, two hundred forty-four thousand, two hundred forty-two".