12012200211221 has 4 divisors (see below), whose sum is σ = 13728228812832. Its totient is φ = 10296171609612.

The previous prime is 12012200211139. The next prime is 12012200211227. The reversal of 12012200211221 is 12211200221021.

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 a de Polignac number, because none of the positive numbers 2^k-12012200211221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12012200211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012200211227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858014300795 + ... + 858014300808.

It is an arithmetic number, because the mean of its divisors is an integer number (3432057203208).

Almost surely, 2^{12012200211221} is an apocalyptic number.

It is an amenable number.

12012200211221 is a deficient number, since it is larger than the sum of its proper divisors (1716028601611).

12012200211221 is an equidigital number, since it uses as much as digits as its factorization.

12012200211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716028601610.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12012200211221 its reverse (12211200221021), we get a palindrome (24223400432242).

The spelling of 12012200211221 in words is "twelve trillion, twelve billion, two hundred million, two hundred eleven thousand, two hundred twenty-one".