211121101111111 has 4 divisors (see below), whose sum is σ = 215613039432672. Its totient is φ = 206629162789552.

The previous prime is 211121101111073. The next prime is 211121101111321. The reversal of 211121101111111 is 111111101121112.

211121101111111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 211121101111111 - 2²³ = 211121092722503 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 (211121101114111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2245969160710 + ... + 2245969160803.

It is an arithmetic number, because the mean of its divisors is an integer number (53903259858168).

Almost surely, 2^{211121101111111} is an apocalyptic number.

211121101111111 is a deficient number, since it is larger than the sum of its proper divisors (4491938321561).

211121101111111 is an equidigital number, since it uses as much as digits as its factorization.

211121101111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491938321560.

The product of its (nonzero) digits is 4, while the sum is 16.

Adding to 211121101111111 its reverse (111111101121112), we get a palindrome (322232202232223).

The spelling of 211121101111111 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred one million, one hundred eleven thousand, one hundred eleven".