216442057 has 4 divisors (see below), whose sum is σ = 233091460. Its totient is φ = 199792656.

The previous prime is 216442033. The next prime is 216442073. The reversal of 216442057 is 750244612.

216442057 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 2 ways, for example, as 133194681 + 83247376 = 11541^2 + 9124^2 .

It is a cyclic number.

It is not a de Polignac number, because 216442057 - 2¹⁵ = 216409289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216442027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8324682 + ... + 8324707.

It is an arithmetic number, because the mean of its divisors is an integer number (58272865).

Almost surely, 2^216442057 is an apocalyptic number.

It is an amenable number.

216442057 is a deficient number, since it is larger than the sum of its proper divisors (16649403).

216442057 is a wasteful number, since it uses less digits than its factorization.

216442057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16649402.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 216442057 is about 14711.9698545096. The cubic root of 216442057 is about 600.4090331268.

Adding to 216442057 its reverse (750244612), we get a palindrome (966686669).

The spelling of 216442057 in words is "two hundred sixteen million, four hundred forty-two thousand, fifty-seven".