21221210000212 has 12 divisors (see below), whose sum is σ = 37153703991040. Its totient is φ = 10605866002776.

The previous prime is 21221210000173. The next prime is 21221210000323. The reversal of 21221210000212 is 21200001212212.

It is a happy number.

It is a super-3 number, since 3×21221210000212³ (a number of 41 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1184739258 + ... + 1184757169.

Almost surely, 2^{21221210000212} is an apocalyptic number.

It is an amenable number.

21221210000212 is a deficient number, since it is larger than the sum of its proper divisors (15932493990828).

21221210000212 is a wasteful number, since it uses less digits than its factorization.

21221210000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369498670 (or 2369498668 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221210000212 its reverse (21200001212212), we get a palindrome (42421211212424).

The spelling of 21221210000212 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred ten million, two hundred twelve", and thus it is an aban number.