211242331111 has 4 divisors (see below), whose sum is σ = 241419806992. Its totient is φ = 181064855232.

The previous prime is 211242331103. The next prime is 211242331159. The reversal of 211242331111 is 111133242112.

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 211242331111 - 2³ = 211242331103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211242331711) 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, 15088737930 + ... + 15088737943.

It is an arithmetic number, because the mean of its divisors is an integer number (60354951748).

Almost surely, 2^211242331111 is an apocalyptic number.

211242331111 is a deficient number, since it is larger than the sum of its proper divisors (30177475881).

211242331111 is an equidigital number, since it uses as much as digits as its factorization.

211242331111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30177475880.

The product of its digits is 288, while the sum is 22.

Adding to 211242331111 its reverse (111133242112), we get a palindrome (322375573223).

The spelling of 211242331111 in words is "two hundred eleven billion, two hundred forty-two million, three hundred thirty-one thousand, one hundred eleven".