2121312232 has 16 divisors (see below), whose sum is σ = 4283419140. Its totient is φ = 979067136.

The previous prime is 2121312143. The next prime is 2121312233. The reversal of 2121312232 is 2322131212.

It can be written as a sum of positive squares in 2 ways, for example, as 2117288196 + 4024036 = 46014^2 + 2006^2 .

It is not an unprimeable number, because it can be changed into a prime (2121312233) 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, 10198513 + ... + 10198720.

Almost surely, 2^2121312232 is an apocalyptic number.

It is an amenable number.

2121312232 is an abundant number, since it is smaller than the sum of its proper divisors (2162106908).

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

2121312232 is a wasteful number, since it uses less digits than its factorization.

2121312232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20397252 (or 20397248 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 2121312232 is about 46057.7054573933. The cubic root of 2121312232 is about 1284.8966556808.

Adding to 2121312232 its reverse (2322131212), we get a palindrome (4443443444).

The spelling of 2121312232 in words is "two billion, one hundred twenty-one million, three hundred twelve thousand, two hundred thirty-two".