2121031312 has 20 divisors (see below), whose sum is σ = 4126700160. Its totient is φ = 1056076448.

The previous prime is 2121031301. The next prime is 2121031321. The reversal of 2121031312 is 2131301212.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273508 + ... + 281155.

It is an arithmetic number, because the mean of its divisors is an integer number (206335008).

Almost surely, 2^2121031312 is an apocalyptic number.

It is an amenable number.

2121031312 is a deficient number, since it is larger than the sum of its proper divisors (2005668848).

2121031312 is a wasteful number, since it uses less digits than its factorization.

2121031312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554910 (or 554904 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2121031312 is about 46054.6557038482. The cubic root of 2121031312 is about 1284.8399346415.

Adding to 2121031312 its reverse (2131301212), we get a palindrome (4252332524).

The spelling of 2121031312 in words is "two billion, one hundred twenty-one million, thirty-one thousand, three hundred twelve".