216342281 has 8 divisors (see below), whose sum is σ = 222448128. Its totient is φ = 210276000.

The previous prime is 216342277. The next prime is 216342319. The reversal of 216342281 is 182243612.

It is a happy number.

216342281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 216342281 - 2² = 216342277 is a prime.

It is a super-2 number, since 2×216342281² = 93607965096565922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216342251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1376 + ... + 20846.

It is an arithmetic number, because the mean of its divisors is an integer number (27806016).

Almost surely, 2^216342281 is an apocalyptic number.

It is an amenable number.

216342281 is a deficient number, since it is larger than the sum of its proper divisors (6105847).

216342281 is a wasteful number, since it uses less digits than its factorization.

216342281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19783.

The product of its digits is 4608, while the sum is 29.

The square root of 216342281 is about 14708.5784833205. The cubic root of 216342281 is about 600.3167595947.

Adding to 216342281 its reverse (182243612), we get a palindrome (398585893).

It can be divided in two parts, 2163 and 42281, that added together give a palindrome (44444).

The spelling of 216342281 in words is "two hundred sixteen million, three hundred forty-two thousand, two hundred eighty-one".