211310211311123 has 4 divisors (see below), whose sum is σ = 211314677954880. Its totient is φ = 211305744667368.

The previous prime is 211310211311113. The next prime is 211310211311159. The reversal of 211310211311123 is 321113112013112.

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 211310211311123 - 2³⁸ = 211035333404179 is a prime.

It is a super-2 number, since 2×211310211311123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211310211311113) 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, 2233250915 + ... + 2233345532.

It is an arithmetic number, because the mean of its divisors is an integer number (52828669488720).

Almost surely, 2^{211310211311123} is an apocalyptic number.

211310211311123 is a deficient number, since it is larger than the sum of its proper divisors (4466643757).

211310211311123 is an equidigital number, since it uses as much as digits as its factorization.

211310211311123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4466643756.

The product of its (nonzero) digits is 216, while the sum is 23.

Adding to 211310211311123 its reverse (321113112013112), we get a palindrome (532423323324235).

The spelling of 211310211311123 in words is "two hundred eleven trillion, three hundred ten billion, two hundred eleven million, three hundred eleven thousand, one hundred twenty-three".