216042115 has 4 divisors (see below), whose sum is σ = 259250544. Its totient is φ = 172833688.

The previous prime is 216042107. The next prime is 216042121. The reversal of 216042115 is 511240612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216042115 - 2³ = 216042107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 21604207 + ... + 21604216.

It is an arithmetic number, because the mean of its divisors is an integer number (64812636).

Almost surely, 2^216042115 is an apocalyptic number.

216042115 is a deficient number, since it is larger than the sum of its proper divisors (43208429).

216042115 is an equidigital number, since it uses as much as digits as its factorization.

216042115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43208428.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 216042115 is about 14698.3711682621. The cubic root of 216042115 is about 600.0389928362.

Adding to 216042115 its reverse (511240612), we get a palindrome (727282727).

The spelling of 216042115 in words is "two hundred sixteen million, forty-two thousand, one hundred fifteen".