216854321 has 4 divisors (see below), whose sum is σ = 217251312. Its totient is φ = 216457332.

The previous prime is 216854303. The next prime is 216854357. The reversal of 216854321 is 123458612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216854321 - 2²² = 212660017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216854821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197675 + ... + 198768.

It is an arithmetic number, because the mean of its divisors is an integer number (54312828).

Almost surely, 2^216854321 is an apocalyptic number.

It is an amenable number.

216854321 is a deficient number, since it is larger than the sum of its proper divisors (396991).

216854321 is an equidigital number, since it uses as much as digits as its factorization.

216854321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396990.

The product of its digits is 11520, while the sum is 32.

The square root of 216854321 is about 14725.9743650463. The cubic root of 216854321 is about 600.7899973468.

The spelling of 216854321 in words is "two hundred sixteen million, eight hundred fifty-four thousand, three hundred twenty-one".