2121100111 has 8 divisors (see below), whose sum is σ = 2287096560. Its totient is φ = 1955508672.

The previous prime is 2121100103. The next prime is 2121100117. The reversal of 2121100111 is 1110011212.

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

It is not a de Polignac number, because 2121100111 - 2³ = 2121100103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121100117) 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, 90325 + ... + 111358.

It is an arithmetic number, because the mean of its divisors is an integer number (285887070).

Almost surely, 2^2121100111 is an apocalyptic number.

2121100111 is a deficient number, since it is larger than the sum of its proper divisors (165996449).

2121100111 is a wasteful number, since it uses less digits than its factorization.

2121100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202505.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 2121100111 is about 46055.4026255335. The cubic root of 2121100111 is about 1284.8538264288.

Adding to 2121100111 its reverse (1110011212), we get a palindrome (3231111323).

The spelling of 2121100111 in words is "two billion, one hundred twenty-one million, one hundred thousand, one hundred eleven".