12213123220321 has 4 divisors (see below), whose sum is σ = 12242984157700. Its totient is φ = 12183262282944.

The previous prime is 12213123220271. The next prime is 12213123220339. The reversal of 12213123220321 is 12302232131221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5160439155600 + 7052684064721 = 2271660^2 + 2655689^2 .

It is a cyclic number.

It is not a de Polignac number, because 12213123220321 - 2¹¹ = 12213123218273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12213123220351) 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, 14930468076 + ... + 14930468893.

It is an arithmetic number, because the mean of its divisors is an integer number (3060746039425).

Almost surely, 2^{12213123220321} is an apocalyptic number.

It is an amenable number.

12213123220321 is a deficient number, since it is larger than the sum of its proper divisors (29860937379).

12213123220321 is an equidigital number, since it uses as much as digits as its factorization.

12213123220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29860937378.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 12213123220321 its reverse (12302232131221), we get a palindrome (24515355351542).

The spelling of 12213123220321 in words is "twelve trillion, two hundred thirteen billion, one hundred twenty-three million, two hundred twenty thousand, three hundred twenty-one".