21222101120 has 128 divisors (see below), whose sum is σ = 55528865280. Its totient is φ = 7691673600.

The previous prime is 21222101119. The next prime is 21222101161. The reversal of 21222101120 is 2110122212.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 21222101095 and 21222101104.

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, 2198705 + ... + 2208335.

It is an arithmetic number, because the mean of its divisors is an integer number (433819260).

Almost surely, 2^21222101120 is an apocalyptic number.

21222101120 is a gapful number since it is divisible by the number (20) 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 21222101120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27764432640).

21222101120 is an abundant number, since it is smaller than the sum of its proper divisors (34306764160).

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

21222101120 is a wasteful number, since it uses less digits than its factorization.

21222101120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9974 (or 9962 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21222101120 its reverse (2110122212), we get a palindrome (23332223332).

The spelling of 21222101120 in words is "twenty-one billion, two hundred twenty-two million, one hundred one thousand, one hundred twenty".