2123221312 has 28 divisors (see below), whose sum is σ = 4358556180. Its totient is φ = 1025002496.

The previous prime is 2123221267. The next prime is 2123221351. The reversal of 2123221312 is 2131223212.

It can be written as a sum of positive squares in 2 ways, for example, as 1665945856 + 457275456 = 40816^2 + 21384^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2123221312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570133 + ... + 573844.

Almost surely, 2^2123221312 is an apocalyptic number.

It is an amenable number.

2123221312 is an abundant number, since it is smaller than the sum of its proper divisors (2235334868).

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

2123221312 is a wasteful number, since it uses less digits than its factorization.

2123221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144018 (or 1144008 counting only the distinct ones).

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

The square root of 2123221312 is about 46078.4256675508. The cubic root of 2123221312 is about 1285.2819887128.

Adding to 2123221312 its reverse (2131223212), we get a palindrome (4254444524).

The spelling of 2123221312 in words is "two billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred twelve".