2121131110 has 48 divisors (see below), whose sum is σ = 4454333856. Its totient is φ = 725125632.

The previous prime is 2121131087. The next prime is 2121131113. The reversal of 2121131110 is 111311212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121131113) 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 23 ways as a sum of consecutive naturals, for example, 166839 + ... + 179101.

It is an arithmetic number, because the mean of its divisors is an integer number (92798622).

Almost surely, 2^2121131110 is an apocalyptic number.

2121131110 is an abundant number, since it is smaller than the sum of its proper divisors (2333202746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121131110 is a wasteful number, since it uses less digits than its factorization.

2121131110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12637 (or 12630 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2121131110 is about 46055.7391646253. The cubic root of 2121131110 is about 1284.8600856005.

Adding to 2121131110 its reverse (111311212), we get a palindrome (2232442322).

The spelling of 2121131110 in words is "two billion, one hundred twenty-one million, one hundred thirty-one thousand, one hundred ten".