216838304281 has 3 divisors (see below), whose sum is σ = 216838769941. Its totient is φ = 216837838622.

The previous prime is 216838304197. The next prime is 216838304299. The reversal of 216838304281 is 182403838612.

The square root of 216838304281 is 465659.

It is a perfect power (a square), and thus also a powerful number.

216838304281 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, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 216838304281 - 2⁹ = 216838303769 is a prime.

It is a super-2 number, since 2×216838304281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216838302281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 232830 + ... + 698488.

Almost surely, 2^216838304281 is an apocalyptic number.

216838304281 is the 465659-th square number.

216838304281 is the 232830-th centered octagonal number.

It is an amenable number.

216838304281 is a deficient number, since it is larger than the sum of its proper divisors (465660).

216838304281 is an frugal number, since it uses more digits than its factorization.

216838304281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931318 (or 465659 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 216838304281 in words is "two hundred sixteen billion, eight hundred thirty-eight million, three hundred four thousand, two hundred eighty-one".