216242042 has 8 divisors (see below), whose sum is σ = 326238516. Its totient is φ = 107495872.

The previous prime is 216242029. The next prime is 216242051. The reversal of 216242042 is 240242612.

It can be written as a sum of positive squares in 2 ways, for example, as 176916601 + 39325441 = 13301^2 + 6271^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 216241999 and 216242017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312143 + ... + 312834.

Almost surely, 2^216242042 is an apocalyptic number.

216242042 is a deficient number, since it is larger than the sum of its proper divisors (109996474).

216242042 is a wasteful number, since it uses less digits than its factorization.

216242042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625152.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 216242042 is about 14705.1705872458. The cubic root of 216242042 is about 600.2240293040.

Adding to 216242042 its reverse (240242612), we get a palindrome (456484654).

The spelling of 216242042 in words is "two hundred sixteen million, two hundred forty-two thousand, forty-two".