21212012202212 has 24 divisors (see below), whose sum is σ = 41354984004600. Its totient is φ = 9452567771136.

The previous prime is 21212012202211. The next prime is 21212012202217. The reversal of 21212012202212 is 21220221021212.

It can be written as a sum of positive squares in 4 ways, for example, as 545314310116 + 20666697892096 = 738454^2 + 4546064^2 .

It is not an unprimeable number, because it can be changed into a prime (21212012202211) 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 7 ways as a sum of consecutive naturals, for example, 7033159037 + ... + 7033162052.

It is an arithmetic number, because the mean of its divisors is an integer number (1723124333525).

Almost surely, 2^{21212012202212} is an apocalyptic number.

It is an amenable number.

21212012202212 is a deficient number, since it is larger than the sum of its proper divisors (20142971802388).

21212012202212 is a wasteful number, since it uses less digits than its factorization.

21212012202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14066321135 (or 14066321133 counting only the distinct ones).

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

Adding to 21212012202212 its reverse (21220221021212), we get a palindrome (42432233223424).

The spelling of 21212012202212 in words is "twenty-one trillion, two hundred twelve billion, twelve million, two hundred two thousand, two hundred twelve".