12321543 has 8 divisors (see below), whose sum is σ = 17692528. Its totient is φ = 7582464.

The previous prime is 12321541. The next prime is 12321559. The reversal of 12321543 is 34512321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12321543 - 2¹ = 12321541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157930 + ... + 158007.

It is an arithmetic number, because the mean of its divisors is an integer number (2211566).

Almost surely, 2^12321543 is an apocalyptic number.

12321543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12321543 is a deficient number, since it is larger than the sum of its proper divisors (5370985).

12321543 is a wasteful number, since it uses less digits than its factorization.

12321543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315953.

The product of its digits is 720, while the sum is 21.

The square root of 12321543 is about 3510.2055495369. The cubic root of 12321543 is about 230.9697117388.

Adding to 12321543 its reverse (34512321), we get a palindrome (46833864).

It can be divided in two parts, 1232 and 1543, that added together give a triangular number (2775 = T₇₄).

The spelling of 12321543 in words is "twelve million, three hundred twenty-one thousand, five hundred forty-three".