12220012211221 has 4 divisors (see below), whose sum is σ = 12222667008832. Its totient is φ = 12217357413612.

The previous prime is 12220012211167. The next prime is 12220012211233. The reversal of 12220012211221 is 12211221002221.

12220012211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 cyclic number.

It is not a de Polignac number, because 12220012211221 - 2¹⁹ = 12220011686933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220012611221) 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, 1327391901 + ... + 1327401106.

It is an arithmetic number, because the mean of its divisors is an integer number (3055666752208).

Almost surely, 2^{12220012211221} is an apocalyptic number.

It is an amenable number.

12220012211221 is a deficient number, since it is larger than the sum of its proper divisors (2654797611).

12220012211221 is an equidigital number, since it uses as much as digits as its factorization.

12220012211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654797610.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12220012211221 its reverse (12211221002221), we get a palindrome (24431233213442).

The spelling of 12220012211221 in words is "twelve trillion, two hundred twenty billion, twelve million, two hundred eleven thousand, two hundred twenty-one".