543212321 has 16 divisors (see below), whose sum is σ = 582519168. Its totient is φ = 505296000.

The previous prime is 543212309. The next prime is 543212377. The reversal of 543212321 is 123212345.

543212321 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a cyclic number.

It is not a de Polignac number, because 543212321 - 2¹⁰ = 543211297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (543212521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373646 + ... + 375096.

It is an arithmetic number, because the mean of its divisors is an integer number (36407448).

Almost surely, 2^543212321 is an apocalyptic number.

It is an amenable number.

543212321 is a deficient number, since it is larger than the sum of its proper divisors (39306847).

543212321 is a wasteful number, since it uses less digits than its factorization.

543212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912.

The product of its digits is 1440, while the sum is 23.

The square root of 543212321 is about 23306.9157333183. The cubic root of 543212321 is about 815.9368308022.

Adding to 543212321 its reverse (123212345), we get a palindrome (666424666).

The spelling of 543212321 in words is "five hundred forty-three million, two hundred twelve thousand, three hundred twenty-one".