21222022120 has 128 divisors (see below), whose sum is σ = 52391888640. Its totient is φ = 7689185280.

The previous prime is 21222022093. The next prime is 21222022123. The reversal of 21222022120 is 2122022212.

It is a junction number, because it is equal to n+sod(n) for n = 21222022094 and 21222022103.

It is not an unprimeable number, because it can be changed into a prime (21222022123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8601127 + ... + 8603593.

It is an arithmetic number, because the mean of its divisors is an integer number (409311630).

Almost surely, 2^21222022120 is an apocalyptic number.

21222022120 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 21222022120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26195944320).

21222022120 is an abundant number, since it is smaller than the sum of its proper divisors (31169866520).

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

21222022120 is a wasteful number, since it uses less digits than its factorization.

21222022120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795 (or 2791 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21222022120 its reverse (2122022212), we get a palindrome (23344044332).

The spelling of 21222022120 in words is "twenty-one billion, two hundred twenty-two million, twenty-two thousand, one hundred twenty".