211121102111 has 4 divisors (see below), whose sum is σ = 211124263224. Its totient is φ = 211117941000.

The previous prime is 211121102077. The next prime is 211121102131. The reversal of 211121102111 is 111201121112.

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-211121102111 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 (211121102131) 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, 1478165 + ... + 1614686.

It is an arithmetic number, because the mean of its divisors is an integer number (52781065806).

Almost surely, 2^211121102111 is an apocalyptic number.

211121102111 is a deficient number, since it is larger than the sum of its proper divisors (3161113).

211121102111 is an equidigital number, since it uses as much as digits as its factorization.

211121102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161112.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211121102111 its reverse (111201121112), we get a palindrome (322322223223).

The spelling of 211121102111 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred two thousand, one hundred eleven".