2100112121 has 4 divisors (see below), whose sum is σ = 2139736932. Its totient is φ = 2060487312.

The previous prime is 2100112117. The next prime is 2100112207. The reversal of 2100112121 is 1212110012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1854249721 + 245862400 = 43061^2 + 15680^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100112121 - 2² = 2100112117 is a prime.

It is a super-2 number, since 2×2100112121² = 8820941841542237282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2100118121) 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, 19812326 + ... + 19812431.

It is an arithmetic number, because the mean of its divisors is an integer number (534934233).

Almost surely, 2^2100112121 is an apocalyptic number.

It is an amenable number.

2100112121 is a deficient number, since it is larger than the sum of its proper divisors (39624811).

2100112121 is an equidigital number, since it uses as much as digits as its factorization.

2100112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39624810.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2100112121 is about 45826.9802736336. The cubic root of 2100112121 is about 1280.6019550290.

Adding to 2100112121 its reverse (1212110012), we get a palindrome (3312222133).

The spelling of 2100112121 in words is "two billion, one hundred million, one hundred twelve thousand, one hundred twenty-one".