21212012220112 has 20 divisors (see below), whose sum is σ = 46969455630496. Its totient is φ = 9090862380000.

The previous prime is 21212012220083. The next prime is 21212012220247. The reversal of 21212012220112 is 21102221021212.

It is a super-3 number, since 3×21212012220112³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21212012220112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94696483014 + ... + 94696483237.

Almost surely, 2^{21212012220112} is an apocalyptic number.

It is an amenable number.

21212012220112 is an abundant number, since it is smaller than the sum of its proper divisors (25757443410384).

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

21212012220112 is a wasteful number, since it uses less digits than its factorization.

21212012220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189392966266 (or 189392966260 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212012220112 its reverse (21102221021212), we get a palindrome (42314233241324).

The spelling of 21212012220112 in words is "twenty-one trillion, two hundred twelve billion, twelve million, two hundred twenty thousand, one hundred twelve".