21021200000212 has 24 divisors (see below), whose sum is σ = 37644551436800. Its totient is φ = 10265639037696.

The previous prime is 21021200000191. The next prime is 21021200000221. The reversal of 21021200000212 is 21200000212012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21021200000192 and 21021200000201.

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 7 ways as a sum of consecutive naturals, for example, 216589 + ... + 6487627.

Almost surely, 2^{21021200000212} is an apocalyptic number.

It is an amenable number.

21021200000212 is a deficient number, since it is larger than the sum of its proper divisors (16623351436588).

21021200000212 is a wasteful number, since it uses less digits than its factorization.

21021200000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6290575 (or 6290573 counting only the distinct ones).

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

Adding to 21021200000212 its reverse (21200000212012), we get a palindrome (42221200212224).

The spelling of 21021200000212 in words is "twenty-one trillion, twenty-one billion, two hundred million, two hundred twelve", and thus it is an aban number.