12213013220321 has 4 divisors (see below), whose sum is σ = 12213409661700. Its totient is φ = 12212616778944.

The previous prime is 12213013220267. The next prime is 12213013220347. The reversal of 12213013220321 is 12302231031221.

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 3746891904721 + 8466121315600 = 1935689^2 + 2909660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12213013220321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12213013220371) 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 3 ways as a sum of consecutive naturals, for example, 198174476 + ... + 198236093.

It is an arithmetic number, because the mean of its divisors is an integer number (3053352415425).

Almost surely, 2^{12213013220321} is an apocalyptic number.

It is an amenable number.

12213013220321 is a deficient number, since it is larger than the sum of its proper divisors (396441379).

12213013220321 is an equidigital number, since it uses as much as digits as its factorization.

12213013220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396441378.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 12213013220321 its reverse (12302231031221), we get a palindrome (24515244251542).

The spelling of 12213013220321 in words is "twelve trillion, two hundred thirteen billion, thirteen million, two hundred twenty thousand, three hundred twenty-one".