21212201222112 has 96 divisors (see below), whose sum is σ = 57563634078720. Its totient is φ = 6832477532160.

The previous prime is 21212201222077. The next prime is 21212201222123. The reversal of 21212201222112 is 21122210221212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3292662 + ... + 7298357.

It is an arithmetic number, because the mean of its divisors is an integer number (599621188320).

Almost surely, 2^{21212201222112} is an apocalyptic number.

It is an amenable number.

21212201222112 is an abundant number, since it is smaller than the sum of its proper divisors (36351432856608).

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

21212201222112 is a wasteful number, since it uses less digits than its factorization.

21212201222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10591736 (or 10591728 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21212201222112 its reverse (21122210221212), we get a palindrome (42334411443324).

The spelling of 21212201222112 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred twenty-two thousand, one hundred twelve".