211121211121111 has 4 divisors (see below), whose sum is σ = 211136396433952. Its totient is φ = 211106025808272.

The previous prime is 211121211121099. The next prime is 211121211121147. The reversal of 211121211121111 is 111121112121112.

211121211121111 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 211121211121111 - 2²⁷ = 211121076903383 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 (211121211121211) 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, 7592635566 + ... + 7592663371.

It is an arithmetic number, because the mean of its divisors is an integer number (52784099108488).

Almost surely, 2^{211121211121111} is an apocalyptic number.

211121211121111 is a deficient number, since it is larger than the sum of its proper divisors (15185312841).

211121211121111 is a wasteful number, since it uses less digits than its factorization.

211121211121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15185312840.

The product of its digits is 16, while the sum is 19.

Adding to 211121211121111 its reverse (111121112121112), we get a palindrome (322242323242223).

It can be divided in two parts, 21112121112 and 1111, that multiplied together give a palindrome (23455566555432).

The spelling of 211121211121111 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred eleven".