216324521449 has 3 divisors (see below), whose sum is σ = 216324986557. Its totient is φ = 216324056342.

The previous prime is 216324521437. The next prime is 216324521521. The reversal of 216324521449 is 944125423612.

The square root of 216324521449 is 465107.

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

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 216324521449 - 2¹³ = 216324513257 is a prime.

It is a super-2 number, since 2×216324521449² (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 (216324521549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 232554 + ... + 697660.

Almost surely, 2^216324521449 is an apocalyptic number.

216324521449 is the 465107-th square number.

216324521449 is the 232554-th centered octagonal number.

It is an amenable number.

216324521449 is a deficient number, since it is larger than the sum of its proper divisors (465108).

216324521449 is an frugal number, since it uses more digits than its factorization.

216324521449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930214 (or 465107 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The spelling of 216324521449 in words is "two hundred sixteen billion, three hundred twenty-four million, five hundred twenty-one thousand, four hundred forty-nine".