12220121022121 has 2 divisors, whose sum is σ = 12220121022122. Its totient is φ = 12220121022120.

The previous prime is 12220121022107. The next prime is 12220121022253. The reversal of 12220121022121 is 12122012102221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12210796416025 + 9324606096 = 3494395^2 + 96564^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220121022121 - 2¹¹ = 12220121020073 is a prime.

It is not a weakly prime, because it can be changed into another prime (12220121022101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110060511060 + 6110060511061.

It is an arithmetic number, because the mean of its divisors is an integer number (6110060511061).

Almost surely, 2^{12220121022121} is an apocalyptic number.

It is an amenable number.

12220121022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220121022121 is an equidigital number, since it uses as much as digits as its factorization.

12220121022121 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 12220121022121 its reverse (12122012102221), we get a palindrome (24342133124342).

The spelling of 12220121022121 in words is "twelve trillion, two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, one hundred twenty-one".