21212102121112 has 96 divisors (see below), whose sum is σ = 46306987539120. Its totient is φ = 9082889303040.

The previous prime is 21212102121083. The next prime is 21212102121127. The reversal of 21212102121112 is 21112120121212.

It is a happy number.

21212102121112 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×21212102121112³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21212102121112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2825639263 + ... + 2825646769.

Almost surely, 2^{21212102121112} is an apocalyptic number.

It is an amenable number.

21212102121112 is an abundant number, since it is smaller than the sum of its proper divisors (25094885418008).

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

21212102121112 is a wasteful number, since it uses less digits than its factorization.

21212102121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12921 (or 12910 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21212102121112 its reverse (21112120121212), we get a palindrome (42324222242324).

The spelling of 21212102121112 in words is "twenty-one trillion, two hundred twelve billion, one hundred two million, one hundred twenty-one thousand, one hundred twelve".