22011212220 has 48 divisors (see below), whose sum is σ = 61853936928. Its totient is φ = 5848462080.

The previous prime is 22011212203. The next prime is 22011212233. The reversal of 22011212220 is 2221211022.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22011212220.

It is a congruent number.

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, 645571 + ... + 678810.

It is an arithmetic number, because the mean of its divisors is an integer number (1288623686).

Almost surely, 2^22011212220 is an apocalyptic number.

22011212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22011212220 is an abundant number, since it is smaller than the sum of its proper divisors (39842724708).

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

22011212220 is a wasteful number, since it uses less digits than its factorization.

22011212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324670 (or 1324668 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22011212220 its reverse (2221211022), we get a palindrome (24232423242).

The spelling of 22011212220 in words is "twenty-two billion, eleven million, two hundred twelve thousand, two hundred twenty".