211222110011111 has 2 divisors, whose sum is σ = 211222110011112. Its totient is φ = 211222110011110.

The previous prime is 211222110011089. The next prime is 211222110011113. The reversal of 211222110011111 is 111110011222112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211222110011111 - 2⁴⁶ = 140853365833447 is a prime.

It is a super-2 number, since 2×211222110011111² (a number of 29 digits) contains 22 as substring.

Together with 211222110011113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211222110011111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222110011113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611055005555 + 105611055005556.

It is an arithmetic number, because the mean of its divisors is an integer number (105611055005556).

Almost surely, 2^{211222110011111} is an apocalyptic number.

211222110011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222110011111 is an equidigital number, since it uses as much as digits as its factorization.

211222110011111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211222110011111 its reverse (111110011222112), we get a palindrome (322332121233223).

The spelling of 211222110011111 in words is "two hundred eleven trillion, two hundred twenty-two billion, one hundred ten million, eleven thousand, one hundred eleven".