21201220000212 has 72 divisors (see below), whose sum is σ = 58521527457120. Its totient is φ = 5954822072640.

The previous prime is 21201220000211. The next prime is 21201220000217. The reversal of 21201220000212 is 21200002210212.

It is a junction number, because it is equal to n+sod(n) for n = 21201220000191 and 21201220000200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201220000211) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 305528839 + ... + 305598222.

It is an arithmetic number, because the mean of its divisors is an integer number (812798992460).

Almost surely, 2^{21201220000212} is an apocalyptic number.

It is an amenable number.

21201220000212 is an abundant number, since it is smaller than the sum of its proper divisors (37320307456908).

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

21201220000212 is a wasteful number, since it uses less digits than its factorization.

21201220000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611127141 (or 611127132 counting only the distinct ones).

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

Adding to 21201220000212 its reverse (21200002210212), we get a palindrome (42401222210424).

The spelling of 21201220000212 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, two hundred twelve", and thus it is an aban number.