2222111212121 has 2 divisors, whose sum is σ = 2222111212122. Its totient is φ = 2222111212120.

The previous prime is 2222111212051. The next prime is 2222111212141. The reversal of 2222111212121 is 1212121112222.

It is an a-pointer prime, because the next prime (2222111212141) can be obtained adding 2222111212121 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2202077923600 + 20033288521 = 1483940^2 + 141539^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222111212121 - 2¹⁸ = 2222110949977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2222111212093 and 2222111212102.

It is not a weakly prime, because it can be changed into another prime (2222111212141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111055606060 + 1111055606061.

It is an arithmetic number, because the mean of its divisors is an integer number (1111055606061).

Almost surely, 2^{2222111212121} is an apocalyptic number.

It is an amenable number.

2222111212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222111212121 is an equidigital number, since it uses as much as digits as its factorization.

2222111212121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 20.

Adding to 2222111212121 its reverse (1212121112222), we get a palindrome (3434232324343).

The spelling of 2222111212121 in words is "two trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".