22156220424 has 96 divisors (see below), whose sum is σ = 60265706400. Its totient is φ = 6784727040.

The previous prime is 22156220369. The next prime is 22156220477. The reversal of 22156220424 is 42402265122.

It is a junction number, because it is equal to n+sod(n) for n = 22156220391 and 22156220400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 842872 + ... + 868760.

It is an arithmetic number, because the mean of its divisors is an integer number (627767775).

Almost surely, 2^22156220424 is an apocalyptic number.

22156220424 is a gapful number since it is divisible by the number (24) 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 22156220424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30132853200).

22156220424 is an abundant number, since it is smaller than the sum of its proper divisors (38109485976).

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

22156220424 is a wasteful number, since it uses less digits than its factorization.

22156220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26135 (or 26118 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 22156220424 its reverse (42402265122), we get a palindrome (64558485546).

The spelling of 22156220424 in words is "twenty-two billion, one hundred fifty-six million, two hundred twenty thousand, four hundred twenty-four".