216424 has 16 divisors (see below), whose sum is σ = 437220. Its totient is φ = 99840.

The previous prime is 216421. The next prime is 216431. The reversal of 216424 is 424612.

216424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 202500 + 13924 = 450^2 + 118^2 .

It is not an unprimeable number, because it can be changed into a prime (216421) 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, 937 + ... + 1144.

2²¹⁶⁴²⁴ is an apocalyptic number.

It is an amenable number.

216424 is an abundant number, since it is smaller than the sum of its proper divisors (220796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216424 is a wasteful number, since it uses less digits than its factorization.

216424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100 (or 2096 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 216424 is about 465.2139292842. The cubic root of 216424 is about 60.0392335991.

It can be divided in two parts, 21642 and 4, that multiplied together give a palindrome (86568).

The spelling of 216424 in words is "two hundred sixteen thousand, four hundred twenty-four".