21222120122012 has 12 divisors (see below), whose sum is σ = 37302316868040. Its totient is φ = 10564315302576.

The previous prime is 21222120122011. The next prime is 21222120122053. The reversal of 21222120122012 is 21022102122212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222120122011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11686188587 + ... + 11686190402.

It is an arithmetic number, because the mean of its divisors is an integer number (3108526405670).

Almost surely, 2^{21222120122012} is an apocalyptic number.

It is an amenable number.

21222120122012 is a deficient number, since it is larger than the sum of its proper divisors (16080196746028).

21222120122012 is a wasteful number, since it uses less digits than its factorization.

21222120122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23372379220 (or 23372379218 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222120122012 its reverse (21022102122212), we get a palindrome (42244222244224).

The spelling of 21222120122012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred twenty-two thousand, twelve".