216455242 has 4 divisors (see below), whose sum is σ = 324682866. Its totient is φ = 108227620.

The previous prime is 216455227. The next prime is 216455243. The reversal of 216455242 is 242554612.

216455242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 169546441 + 46908801 = 13021^2 + 6849^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (216455243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54113809 + ... + 54113812.

Almost surely, 2^216455242 is an apocalyptic number.

216455242 is a deficient number, since it is larger than the sum of its proper divisors (108227624).

216455242 is a wasteful number, since it uses less digits than its factorization.

216455242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108227623.

The product of its digits is 19200, while the sum is 31.

The square root of 216455242 is about 14712.4179521926. The cubic root of 216455242 is about 600.4212245843.

The spelling of 216455242 in words is "two hundred sixteen million, four hundred fifty-five thousand, two hundred forty-two".