211111212011123 has 4 divisors (see below), whose sum is σ = 217921251108288. Its totient is φ = 204301172913960.

The previous prime is 211111212011039. The next prime is 211111212011137. The reversal of 211111212011123 is 321110212111112.

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 211111212011123 - 2⁴² = 206713165500019 is a prime.

It is a super-2 number, since 2×211111212011123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211111212011095 and 211111212011104.

It is not an unprimeable number, because it can be changed into a prime (211111212011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3405019548536 + ... + 3405019548597.

It is an arithmetic number, because the mean of its divisors is an integer number (54480312777072).

Almost surely, 2^{211111212011123} is an apocalyptic number.

211111212011123 is a deficient number, since it is larger than the sum of its proper divisors (6810039097165).

211111212011123 is an equidigital number, since it uses as much as digits as its factorization.

211111212011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810039097164.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 211111212011123 its reverse (321110212111112), we get a palindrome (532221424122235).

The spelling of 211111212011123 in words is "two hundred eleven trillion, one hundred eleven billion, two hundred twelve million, eleven thousand, one hundred twenty-three".