211111020110111 has 4 divisors (see below), whose sum is σ = 230302931029224. Its totient is φ = 191919109191000.

The previous prime is 211111020110099. The next prime is 211111020110117. The reversal of 211111020110111 is 111011020111112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211111020110111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111020110117) 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 3 ways as a sum of consecutive naturals, for example, 9595955459540 + ... + 9595955459561.

It is an arithmetic number, because the mean of its divisors is an integer number (57575732757306).

Almost surely, 2^{211111020110111} is an apocalyptic number.

211111020110111 is a deficient number, since it is larger than the sum of its proper divisors (19191910919113).

211111020110111 is a wasteful number, since it uses less digits than its factorization.

211111020110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19191910919112.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 211111020110111 its reverse (111011020111112), we get a palindrome (322122040221223).

The spelling of 211111020110111 in words is "two hundred eleven trillion, one hundred eleven billion, twenty million, one hundred ten thousand, one hundred eleven".