12220121126221 has 2 divisors, whose sum is σ = 12220121126222. Its totient is φ = 12220121126220.

The previous prime is 12220121126197. The next prime is 12220121126263. The reversal of 12220121126221 is 12262112102221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11317505222500 + 902615903721 = 3364150^2 + 950061^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220121126221 - 2²⁵ = 12220087571789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220121126281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110060563110 + 6110060563111.

It is an arithmetic number, because the mean of its divisors is an integer number (6110060563111).

Almost surely, 2^{12220121126221} is an apocalyptic number.

It is an amenable number.

12220121126221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220121126221 is an equidigital number, since it uses as much as digits as its factorization.

12220121126221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 12220121126221 its reverse (12262112102221), we get a palindrome (24482233228442).

The spelling of 12220121126221 in words is "twelve trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty-six thousand, two hundred twenty-one".