12210022222121 has 2 divisors, whose sum is σ = 12210022222122. Its totient is φ = 12210022222120.

The previous prime is 12210022222109. The next prime is 12210022222159. The reversal of 12210022222121 is 12122222001221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7388203515625 + 4821818706496 = 2718125^2 + 2195864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12210022222121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12210022222093 and 12210022222102.

It is not a weakly prime, because it can be changed into another prime (12210022222921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105011111060 + 6105011111061.

It is an arithmetic number, because the mean of its divisors is an integer number (6105011111061).

Almost surely, 2^{12210022222121} is an apocalyptic number.

It is an amenable number.

12210022222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12210022222121 is an equidigital number, since it uses as much as digits as its factorization.

12210022222121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12210022222121 its reverse (12122222001221), we get a palindrome (24332244223342).

The spelling of 12210022222121 in words is "twelve trillion, two hundred ten billion, twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".