21330122112 has 192 divisors, whose sum is σ = 66456149760. Its totient is φ = 6527877120.

The previous prime is 21330122111. The next prime is 21330122123. The reversal of 21330122112 is 21122103312.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330122111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2856688 + ... + 2864144.

It is an arithmetic number, because the mean of its divisors is an integer number (346125780).

Almost surely, 2^21330122112 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 21330122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33228074880).

21330122112 is an abundant number, since it is smaller than the sum of its proper divisors (45126027648).

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

21330122112 is a wasteful number, since it uses less digits than its factorization.

21330122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7681 (or 7666 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21330122112 its reverse (21122103312), we get a palindrome (42452225424).

The spelling of 21330122112 in words is "twenty-one billion, three hundred thirty million, one hundred twenty-two thousand, one hundred twelve".