21222120012112 has 20 divisors (see below), whose sum is σ = 43281955288480. Its totient is φ = 10052583163488.

The previous prime is 21222120012103. The next prime is 21222120012133. The reversal of 21222120012112 is 21121002122212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21222120012112.

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, 34904802348 + ... + 34904802955.

It is an arithmetic number, because the mean of its divisors is an integer number (2164097764424).

Almost surely, 2^{21222120012112} is an apocalyptic number.

It is an amenable number.

21222120012112 is an abundant number, since it is smaller than the sum of its proper divisors (22059835276368).

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

21222120012112 is a wasteful number, since it uses less digits than its factorization.

21222120012112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69809605330 (or 69809605324 counting only the distinct ones).

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

Adding to 21222120012112 its reverse (21121002122212), we get a palindrome (42343122134324).

The spelling of 21222120012112 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, twelve thousand, one hundred twelve".