21212010212 has 12 divisors (see below), whose sum is σ = 38401053180. Its totient is φ = 10240280736.

The previous prime is 21212010187. The next prime is 21212010217. The reversal of 21212010212 is 21201021212.

It can be written as a sum of positive squares in 2 ways, for example, as 4461438436 + 16750571776 = 66794^2 + 129424^2 .

It is not an unprimeable number, because it can be changed into a prime (21212010217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91430963 + ... + 91431194.

It is an arithmetic number, because the mean of its divisors is an integer number (3200087765).

Almost surely, 2^21212010212 is an apocalyptic number.

It is an amenable number.

21212010212 is a deficient number, since it is larger than the sum of its proper divisors (17189042968).

21212010212 is a wasteful number, since it uses less digits than its factorization.

21212010212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182862190 (or 182862188 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21212010212 its reverse (21201021212), we get a palindrome (42413031424).

The spelling of 21212010212 in words is "twenty-one billion, two hundred twelve million, ten thousand, two hundred twelve".