21222221522112 has 168 divisors, whose sum is σ = 65516618207040. Its totient is φ = 6529142108160.

The previous prime is 21222221522077. The next prime is 21222221522129. The reversal of 21222221522112 is 21122512222212.

21222221522112 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 2 + 2 + 21 + 522 + 112 = 666.

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, 64840089 + ... + 65166567.

It is an arithmetic number, because the mean of its divisors is an integer number (389979870280).

Almost surely, 2^{21222221522112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222221522112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32758309103520).

21222221522112 is an abundant number, since it is smaller than the sum of its proper divisors (44294396684928).

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

21222221522112 is a wasteful number, since it uses less digits than its factorization.

21222221522112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335191 (or 335178 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

Adding to 21222221522112 its reverse (21122512222212), we get a palindrome (42344733744324).

The spelling of 21222221522112 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, five hundred twenty-two thousand, one hundred twelve".