12321055 has 4 divisors (see below), whose sum is σ = 14785272. Its totient is φ = 9856840.

The previous prime is 12321053. The next prime is 12321061. The reversal of 12321055 is 55012321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12321055 - 2¹ = 12321053 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 (12321053) 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 3 ways as a sum of consecutive naturals, for example, 1232101 + ... + 1232110.

It is an arithmetic number, because the mean of its divisors is an integer number (3696318).

Almost surely, 2^12321055 is an apocalyptic number.

12321055 is a deficient number, since it is larger than the sum of its proper divisors (2464217).

12321055 is an equidigital number, since it uses as much as digits as its factorization.

12321055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464216.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 12321055 is about 3510.1360372498. The cubic root of 12321055 is about 230.9666624804.

Adding to 12321055 its reverse (55012321), we get a palindrome (67333376).

The spelling of 12321055 in words is "twelve million, three hundred twenty-one thousand, fifty-five".