216219724 has 24 divisors (see below), whose sum is σ = 433026720. Its totient is φ = 92539776.

The previous prime is 216219709. The next prime is 216219727. The reversal of 216219724 is 427912612.

It is a self number, because there is not a number n which added to its sum of digits gives 216219724.

It is not an unprimeable number, because it can be changed into a prime (216219727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17472 + ... + 27160.

It is an arithmetic number, because the mean of its divisors is an integer number (18042780).

Almost surely, 2^216219724 is an apocalyptic number.

It is an amenable number.

216219724 is an abundant number, since it is smaller than the sum of its proper divisors (216806996).

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

216219724 is a wasteful number, since it uses less digits than its factorization.

216219724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10497 (or 10495 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 216219724 is about 14704.4117189366. The cubic root of 216219724 is about 600.2033792019.

The spelling of 216219724 in words is "two hundred sixteen million, two hundred nineteen thousand, seven hundred twenty-four".