2121221112212 has 6 divisors (see below), whose sum is σ = 3712136946378. Its totient is φ = 1060610556104.

The previous prime is 2121221112191. The next prime is 2121221112299. The reversal of 2121221112212 is 2122111221212.

It can be written as a sum of positive squares in only one way, i.e., 1749260179216 + 371960932996 = 1322596^2 + 609886^2 .

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265152639023 + ... + 265152639030.

It is an arithmetic number, because the mean of its divisors is an integer number (618689491063).

Almost surely, 2^{2121221112212} is an apocalyptic number.

It is an amenable number.

2121221112212 is a deficient number, since it is larger than the sum of its proper divisors (1590915834166).

2121221112212 is a wasteful number, since it uses less digits than its factorization.

2121221112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530305278057 (or 530305278055 counting only the distinct ones).

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

Adding to 2121221112212 its reverse (2122111221212), we get a palindrome (4243332333424).

The spelling of 2121221112212 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twelve".