21222022122 has 96 divisors (see below), whose sum is σ = 55733932800. Its totient is φ = 5704680960.

The previous prime is 21222022093. The next prime is 21222022123. The reversal of 21222022122 is 22122022212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21222022095 and 21222022104.

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 47 ways as a sum of consecutive naturals, for example, 116754 + ... + 236802.

It is an arithmetic number, because the mean of its divisors is an integer number (580561800).

Almost surely, 2^21222022122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222022122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27866966400).

21222022122 is an abundant number, since it is smaller than the sum of its proper divisors (34511910678).

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

21222022122 is a wasteful number, since it uses less digits than its factorization.

21222022122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120148 (or 120145 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222022122 its reverse (22122022212), we get a palindrome (43344044334).

The spelling of 21222022122 in words is "twenty-one billion, two hundred twenty-two million, twenty-two thousand, one hundred twenty-two".