201311321111 has 4 divisors (see below), whose sum is σ = 201312817152. Its totient is φ = 201309825072.

The previous prime is 201311321093. The next prime is 201311321117. The reversal of 201311321111 is 111123113102.

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 201311321111 - 2²² = 201307126807 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 201311321111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201311321117) 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, 523766 + ... + 822771.

It is an arithmetic number, because the mean of its divisors is an integer number (50328204288).

Almost surely, 2^201311321111 is an apocalyptic number.

201311321111 is a deficient number, since it is larger than the sum of its proper divisors (1496041).

201311321111 is a wasteful number, since it uses less digits than its factorization.

201311321111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496040.

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

Adding to 201311321111 its reverse (111123113102), we get a palindrome (312434434213).

The spelling of 201311321111 in words is "two hundred one billion, three hundred eleven million, three hundred twenty-one thousand, one hundred eleven".