21221120000212 has 48 divisors (see below), whose sum is σ = 42325000139520. Its totient is φ = 9221132816000.

The previous prime is 21221120000189. The next prime is 21221120000219. The reversal of 21221120000212 is 21200002112212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221120000219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82202668 + ... + 82460419.

It is an arithmetic number, because the mean of its divisors is an integer number (881770836240).

Almost surely, 2^{21221120000212} is an apocalyptic number.

21221120000212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221120000212 is a deficient number, since it is larger than the sum of its proper divisors (21103880139308).

21221120000212 is a wasteful number, since it uses less digits than its factorization.

21221120000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164663232 (or 164663230 counting only the distinct ones).

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

Adding to 21221120000212 its reverse (21200002112212), we get a palindrome (42421122112424).

The spelling of 21221120000212 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twelve", and thus it is an aban number.