2112123311 has 4 divisors (see below), whose sum is σ = 2112675624. Its totient is φ = 2111571000.

The previous prime is 2112123289. The next prime is 2112123313. The reversal of 2112123311 is 1133212112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2112123311 is a prime.

It is a super-2 number, since 2×2112123311² = 8922129761739205442, which contains 22 as substring.

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 2112123311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112123313) 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, 270380 + ... + 278081.

It is an arithmetic number, because the mean of its divisors is an integer number (528168906).

Almost surely, 2^2112123311 is an apocalyptic number.

2112123311 is a deficient number, since it is larger than the sum of its proper divisors (552313).

2112123311 is an equidigital number, since it uses as much as digits as its factorization.

2112123311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552312.

The product of its digits is 72, while the sum is 17.

The square root of 2112123311 is about 45957.8427583367. The cubic root of 2112123311 is about 1283.0387014787.

Adding to 2112123311 its reverse (1133212112), we get a palindrome (3245335423).

The spelling of 2112123311 in words is "two billion, one hundred twelve million, one hundred twenty-three thousand, three hundred eleven".