21212000212 has 12 divisors (see below), whose sum is σ = 39976462036. Its totient is φ = 9790153920.

The previous prime is 21212000203. The next prime is 21212000261. The reversal of 21212000212 is 21200021212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9983207056 + 11228793156 = 99916^2 + 105966^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21212000192 and 21212000201.

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 in 3 ways as a sum of consecutive naturals, for example, 203961489 + ... + 203961592.

Almost surely, 2^21212000212 is an apocalyptic number.

It is an amenable number.

21212000212 is a deficient number, since it is larger than the sum of its proper divisors (18764461824).

21212000212 is a wasteful number, since it uses less digits than its factorization.

21212000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407923098 (or 407923096 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21212000212 its reverse (21200021212), we get a palindrome (42412021424).

The spelling of 21212000212 in words is "twenty-one billion, two hundred twelve million, two hundred twelve", and thus it is an aban number.