211312310111 has 4 divisors (see below), whose sum is σ = 241499782992. Its totient is φ = 181124837232.

The previous prime is 211312310063. The next prime is 211312310137. The reversal of 211312310111 is 111013213112.

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 211312310111 - 2⁶ = 211312310047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211312310111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211312310311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15093736430 + ... + 15093736443.

It is an arithmetic number, because the mean of its divisors is an integer number (60374945748).

Almost surely, 2^211312310111 is an apocalyptic number.

211312310111 is a deficient number, since it is larger than the sum of its proper divisors (30187472881).

211312310111 is an equidigital number, since it uses as much as digits as its factorization.

211312310111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30187472880.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 211312310111 its reverse (111013213112), we get a palindrome (322325523223).

The spelling of 211312310111 in words is "two hundred eleven billion, three hundred twelve million, three hundred ten thousand, one hundred eleven".