21212200000212 has 48 divisors (see below), whose sum is σ = 53302773361152. Its totient is φ = 6526791331200.

The previous prime is 21212200000177. The next prime is 21212200000231. The reversal of 21212200000212 is 21200000221212.

It is a junction number, because it is equal to n+sod(n) for n = 21212200000191 and 21212200000200.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35541462 + ... + 36133362.

It is an arithmetic number, because the mean of its divisors is an integer number (1110474445024).

Almost surely, 2^{21212200000212} is an apocalyptic number.

It is an amenable number.

21212200000212 is an abundant number, since it is smaller than the sum of its proper divisors (32090573360940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212200000212 is a wasteful number, since it uses less digits than its factorization.

21212200000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821648 (or 821646 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21212200000212 its reverse (21200000221212), we get a palindrome (42412200221424).

The spelling of 21212200000212 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, two hundred twelve", and thus it is an aban number.