2121112111 has 8 divisors (see below), whose sum is σ = 2129281920. Its totient is φ = 2112958848.

The previous prime is 2121112093. The next prime is 2121112157. The reversal of 2121112111 is 1112111212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121112111 - 2⁵ = 2121112079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121112091 and 2121112100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121112181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291955 + ... + 299131.

It is an arithmetic number, because the mean of its divisors is an integer number (266160240).

Almost surely, 2^2121112111 is an apocalyptic number.

2121112111 is a deficient number, since it is larger than the sum of its proper divisors (8169809).

2121112111 is an equidigital number, since it uses as much as digits as its factorization.

2121112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8273.

The product of its digits is 8, while the sum is 13.

The square root of 2121112111 is about 46055.5329032246. The cubic root of 2121112111 is about 1284.8562494193.

Adding to 2121112111 its reverse (1112111212), we get a palindrome (3233223323).

It can be divided in two parts, 212111211 and 1, that added together give a palindrome (212111212).

The spelling of 2121112111 in words is "two billion, one hundred twenty-one million, one hundred twelve thousand, one hundred eleven".