21222112210112 has 112 divisors (see below), whose sum is σ = 46242308937600. Its totient is φ = 9583207925760.

The previous prime is 21222112210087. The next prime is 21222112210241. The reversal of 21222112210112 is 21101221122212.

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, 282137564 + ... + 282212772.

Almost surely, 2^{21222112210112} is an apocalyptic number.

21222112210112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222112210112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23121154468800).

21222112210112 is an abundant number, since it is smaller than the sum of its proper divisors (25020196727488).

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

21222112210112 is a wasteful number, since it uses less digits than its factorization.

21222112210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77854 (or 77844 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21222112210112 its reverse (21101221122212), we get a palindrome (42323333332324).

The spelling of 21222112210112 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, two hundred ten thousand, one hundred twelve".