212111011111 has 16 divisors (see below), whose sum is σ = 221473880320. Its totient is φ = 202914408960.

The previous prime is 212111011103. The next prime is 212111011127. The reversal of 212111011111 is 111110111212.

212111011111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 212111011111 - 2³ = 212111011103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212111011091 and 212111011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111011811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1390621 + ... + 1535593.

It is an arithmetic number, because the mean of its divisors is an integer number (13842117520).

Almost surely, 2^212111011111 is an apocalyptic number.

212111011111 is a deficient number, since it is larger than the sum of its proper divisors (9362869209).

212111011111 is a wasteful number, since it uses less digits than its factorization.

212111011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145546.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 212111011111 its reverse (111110111212), we get a palindrome (323221122323).

The spelling of 212111011111 in words is "two hundred twelve billion, one hundred eleven million, eleven thousand, one hundred eleven".