12122211220111 has 2 divisors, whose sum is σ = 12122211220112. Its totient is φ = 12122211220110.

The previous prime is 12122211220109. The next prime is 12122211220129. The reversal of 12122211220111 is 11102211222121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (11102211222121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12122211220111 - 2¹ = 12122211220109 is a prime.

Together with 12122211220109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12122211620111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061105610055 + 6061105610056.

It is an arithmetic number, because the mean of its divisors is an integer number (6061105610056).

Almost surely, 2^{12122211220111} is an apocalyptic number.

12122211220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122211220111 is an equidigital number, since it uses as much as digits as its factorization.

12122211220111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12122211220111 its reverse (11102211222121), we get a palindrome (23224422442232).

The spelling of 12122211220111 in words is "twelve trillion, one hundred twenty-two billion, two hundred eleven million, two hundred twenty thousand, one hundred eleven".