2128121212 has 24 divisors (see below), whose sum is σ = 4257326304. Its totient is φ = 911819712.

The previous prime is 2128121189. The next prime is 2128121249. The reversal of 2128121212 is 2121218212.

2128121212 is a modest number, since divided by 121212 gives 2128 as remainder.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 146418 + ... + 160294.

It is an arithmetic number, because the mean of its divisors is an integer number (177388596).

Almost surely, 2^2128121212 is an apocalyptic number.

It is an amenable number.

2128121212 is an abundant number, since it is smaller than the sum of its proper divisors (2129205092).

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

2128121212 is a wasteful number, since it uses less digits than its factorization.

2128121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19365 (or 19363 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

The square root of 2128121212 is about 46131.5641616453. The cubic root of 2128121212 is about 1286.2699395528.

Adding to 2128121212 its reverse (2121218212), we get a palindrome (4249339424).

The spelling of 2128121212 in words is "two billion, one hundred twenty-eight million, one hundred twenty-one thousand, two hundred twelve".