12221200001221 has 4 divisors (see below), whose sum is σ = 12221368984332. Its totient is φ = 12221031018112.

The previous prime is 12221200001201. The next prime is 12221200001287. The reversal of 12221200001221 is 12210000212221.

It is a happy number.

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 9710147764321 + 2511052236900 = 3116111^2 + 1584630^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221200001221 - 2⁷ = 12221200001093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221200001195 and 12221200001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221200001201) 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, 84383026 + ... + 84527731.

It is an arithmetic number, because the mean of its divisors is an integer number (3055342246083).

Almost surely, 2^{12221200001221} is an apocalyptic number.

It is an amenable number.

12221200001221 is a deficient number, since it is larger than the sum of its proper divisors (168983111).

12221200001221 is an equidigital number, since it uses as much as digits as its factorization.

12221200001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168983110.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12221200001221 its reverse (12210000212221), we get a palindrome (24431200213442).

The spelling of 12221200001221 in words is "twelve trillion, two hundred twenty-one billion, two hundred million, one thousand, two hundred twenty-one".