12321011221 has 8 divisors (see below), whose sum is σ = 12348202464. Its totient is φ = 12293839920.

The previous prime is 12321011207. The next prime is 12321011231. The reversal of 12321011221 is 12211012321.

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

It is a cyclic number.

It is not a de Polignac number, because 12321011221 - 2¹⁷ = 12320880149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12321011195 and 12321011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321011231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2368195 + ... + 2373391.

It is an arithmetic number, because the mean of its divisors is an integer number (1543525308).

Almost surely, 2^12321011221 is an apocalyptic number.

It is an amenable number.

12321011221 is a deficient number, since it is larger than the sum of its proper divisors (27191243).

12321011221 is an equidigital number, since it uses as much as digits as its factorization.

12321011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9971.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12321011221 its reverse (12211012321), we get a palindrome (24532023542).

It can be divided in two parts, 123210 and 11221, that added together give a palindrome (134431).

The spelling of 12321011221 in words is "twelve billion, three hundred twenty-one million, eleven thousand, two hundred twenty-one".