216310421 has 4 divisors (see below), whose sum is σ = 227695200. Its totient is φ = 204925644.

The previous prime is 216310379. The next prime is 216310427. The reversal of 216310421 is 124013612.

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 216310421 - 2¹⁰ = 216309397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216310393 and 216310402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216310427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5692361 + ... + 5692398.

It is an arithmetic number, because the mean of its divisors is an integer number (56923800).

Almost surely, 2^216310421 is an apocalyptic number.

It is an amenable number.

216310421 is a deficient number, since it is larger than the sum of its proper divisors (11384779).

216310421 is a wasteful number, since it uses less digits than its factorization.

216310421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11384778.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 216310421 is about 14707.4954020051. The cubic root of 216310421 is about 600.2872892714.

The spelling of 216310421 in words is "two hundred sixteen million, three hundred ten thousand, four hundred twenty-one".