2121221212112 has 20 divisors (see below), whose sum is σ = 4110093187200. Its totient is φ = 1060552002528.

The previous prime is 2121221212087. The next prime is 2121221212141. The reversal of 2121221212112 is 2112121221212.

It is a nude number because it is divisible by every one of its digits.

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, 3363362 + ... + 3943937.

It is an arithmetic number, because the mean of its divisors is an integer number (205504659360).

Almost surely, 2^{2121221212112} is an apocalyptic number.

It is an amenable number.

2121221212112 is a deficient number, since it is larger than the sum of its proper divisors (1988871975088).

2121221212112 is a wasteful number, since it uses less digits than its factorization.

2121221212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325450 (or 7325444 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

Adding to 2121221212112 its reverse (2112121221212), we get a palindrome (4233342433324).

The spelling of 2121221212112 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twelve".