22212222500 has 60 divisors (see below), whose sum is σ = 52310202252. Its totient is φ = 8201424000.

The previous prime is 22212222463. The next prime is 22212222509. The reversal of 22212222500 is 522221222.

It can be written as a sum of positive squares in 10 ways, for example, as 21818834944 + 393387556 = 147712^2 + 19834^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (22212222509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 309227 + ... + 374226.

Almost surely, 2^22212222500 is an apocalyptic number.

22212222500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22212222500 is an abundant number, since it is smaller than the sum of its proper divisors (30097979752).

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

22212222500 is a wasteful number, since it uses less digits than its factorization.

22212222500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683490 (or 683473 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 22212222500 its reverse (522221222), we get a palindrome (22734443722).

The spelling of 22212222500 in words is "twenty-two billion, two hundred twelve million, two hundred twenty-two thousand, five hundred".