12122221001221 has 2 divisors, whose sum is σ = 12122221001222. Its totient is φ = 12122221001220.

The previous prime is 12122221001173. The next prime is 12122221001243. The reversal of 12122221001221 is 12210012222121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10618728132321 + 1503492868900 = 3258639^2 + 1226170^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122221001221 - 2³³ = 12113631066629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12122221001291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061110500610 + 6061110500611.

It is an arithmetic number, because the mean of its divisors is an integer number (6061110500611).

Almost surely, 2^{12122221001221} is an apocalyptic number.

It is an amenable number.

12122221001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122221001221 is an equidigital number, since it uses as much as digits as its factorization.

12122221001221 is an evil number, because the sum of its binary digits is even.

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

Adding to 12122221001221 its reverse (12210012222121), we get a palindrome (24332233223342).

The spelling of 12122221001221 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-one million, one thousand, two hundred twenty-one".