22122212220 has 72 divisors (see below), whose sum is σ = 67159847664. Its totient is φ = 5894350848.

The previous prime is 22122212213. The next prime is 22122212311. The reversal of 22122212220 is 2221222122.

22122212220 is a `hidden beast` number, since 221 + 2 + 221 + 2 + 220 = 666.

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 = 22122212193 and 22122212202.

It is a congruent number.

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, 168567 + ... + 269553.

It is an arithmetic number, because the mean of its divisors is an integer number (932775662).

Almost surely, 2^22122212220 is an apocalyptic number.

22122212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22122212220 is an abundant number, since it is smaller than the sum of its proper divisors (45037635444).

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

22122212220 is a wasteful number, since it uses less digits than its factorization.

22122212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102219 (or 102214 counting only the distinct ones).

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

Adding to 22122212220 its reverse (2221222122), we get a palindrome (24343434342).

The spelling of 22122212220 in words is "twenty-two billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty".