12221011211221 has 4 divisors (see below), whose sum is σ = 12221134455244. Its totient is φ = 12220887967200.

The previous prime is 12221011211209. The next prime is 12221011211263. The reversal of 12221011211221 is 12211211012221.

It is a happy number.

12221011211221 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.

It can be written as a sum of positive squares in 2 ways, for example, as 11403379318321 + 817631892900 = 3376889^2 + 904230^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221011211221 - 2³⁷ = 12083572257749 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 (12221011211621) 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, 61473150 + ... + 61671631.

It is an arithmetic number, because the mean of its divisors is an integer number (3055283613811).

Almost surely, 2^{12221011211221} is an apocalyptic number.

It is an amenable number.

12221011211221 is a deficient number, since it is larger than the sum of its proper divisors (123244023).

12221011211221 is an equidigital number, since it uses as much as digits as its factorization.

12221011211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123244022.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12221011211221 its reverse (12211211012221), we get a palindrome (24432222223442).

The spelling of 12221011211221 in words is "twelve trillion, two hundred twenty-one billion, eleven million, two hundred eleven thousand, two hundred twenty-one".