12222121204321 has 4 divisors (see below), whose sum is σ = 13968138519232. Its totient is φ = 10476103889412.

The previous prime is 12222121204259. The next prime is 12222121204343. The reversal of 12222121204321 is 12340212122221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12222121204321 - 2¹¹ = 12222121202273 is a prime.

It is a super-2 number, since 2×12222121204321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12222121214321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873008657445 + ... + 873008657458.

It is an arithmetic number, because the mean of its divisors is an integer number (3492034629808).

Almost surely, 2^{12222121204321} is an apocalyptic number.

It is an amenable number.

12222121204321 is a deficient number, since it is larger than the sum of its proper divisors (1746017314911).

12222121204321 is an equidigital number, since it uses as much as digits as its factorization.

12222121204321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746017314910.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 12222121204321 its reverse (12340212122221), we get a palindrome (24562333326542).

The spelling of 12222121204321 in words is "twelve trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred four thousand, three hundred twenty-one".