2121311312 has 20 divisors (see below), whose sum is σ = 4132753716. Its totient is φ = 1054794240.

The previous prime is 2121311287. The next prime is 2121311317. The reversal of 2121311312 is 2131131212.

It can be written as a sum of positive squares in 2 ways, for example, as 325585936 + 1795725376 = 18044^2 + 42376^2 .

It is a super-2 number, since 2×2121311312² = 8999923364838322688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121311317) 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, 363353 + ... + 369144.

Almost surely, 2^2121311312 is an apocalyptic number.

It is an amenable number.

2121311312 is a deficient number, since it is larger than the sum of its proper divisors (2011442404).

2121311312 is a wasteful number, since it uses less digits than its factorization.

2121311312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732686 (or 732680 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 2121311312 is about 46057.6954699212. The cubic root of 2121311312 is about 1284.8964699302.

Adding to 2121311312 its reverse (2131131212), we get a palindrome (4252442524).

The spelling of 2121311312 in words is "two billion, one hundred twenty-one million, three hundred eleven thousand, three hundred twelve".