212100011111 has 2 divisors, whose sum is σ = 212100011112. Its totient is φ = 212100011110.

The previous prime is 212100011107. The next prime is 212100011161. The reversal of 212100011111 is 111110001212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212100011111 - 2² = 212100011107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212100011092 and 212100011101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212100011161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050005555 + 106050005556.

It is an arithmetic number, because the mean of its divisors is an integer number (106050005556).

Almost surely, 2^212100011111 is an apocalyptic number.

212100011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

212100011111 is an equidigital number, since it uses as much as digits as its factorization.

212100011111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 212100011111 its reverse (111110001212), we get a palindrome (323210012323).

The spelling of 212100011111 in words is "two hundred twelve billion, one hundred million, eleven thousand, one hundred eleven".