12321345 has 32 divisors (see below), whose sum is σ = 21064320. Its totient is φ = 6128640.

The previous prime is 12321343. The next prime is 12321359. The reversal of 12321345 is 54312321.

It is not a de Polignac number, because 12321345 - 2¹ = 12321343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12321341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53691 + ... + 53919.

It is an arithmetic number, because the mean of its divisors is an integer number (658260).

Almost surely, 2^12321345 is an apocalyptic number.

12321345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12321345 is a deficient number, since it is larger than the sum of its proper divisors (8742975).

12321345 is a wasteful number, since it uses less digits than its factorization.

12321345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465.

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

The square root of 12321345 is about 3510.1773459471. The cubic root of 12321345 is about 230.9684745494.

Adding to 12321345 its reverse (54312321), we get a palindrome (66633666).

The spelling of 12321345 in words is "twelve million, three hundred twenty-one thousand, three hundred forty-five".