21012200212 has 24 divisors (see below), whose sum is σ = 38313021600. Its totient is φ = 10070835936.

The previous prime is 21012200201. The next prime is 21012200219. The reversal of 21012200212 is 21200221012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21012200192 and 21012200201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012200219) 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 7 ways as a sum of consecutive naturals, for example, 635458 + ... + 667705.

It is an arithmetic number, because the mean of its divisors is an integer number (1596375900).

Almost surely, 2^21012200212 is an apocalyptic number.

It is an amenable number.

21012200212 is a deficient number, since it is larger than the sum of its proper divisors (17300821388).

21012200212 is a wasteful number, since it uses less digits than its factorization.

21012200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303335 (or 1303333 counting only the distinct ones).

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

Adding to 21012200212 its reverse (21200221012), we get a palindrome (42212421224).

The spelling of 21012200212 in words is "twenty-one billion, twelve million, two hundred thousand, two hundred twelve".