22221211200 has 84 divisors (see below), whose sum is σ = 72904106160. Its totient is φ = 5925655040.

The previous prime is 22221211163. The next prime is 22221211213. The reversal of 22221211200 is 211212222.

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 22221211200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2309910 + ... + 2319509.

Almost surely, 2^22221211200 is an apocalyptic number.

22221211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221211200 is an abundant number, since it is smaller than the sum of its proper divisors (50682894960).

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

22221211200 is a wasteful number, since it uses less digits than its factorization.

22221211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629444 (or 4629429 counting only the distinct ones).

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

Adding to 22221211200 its reverse (211212222), we get a palindrome (22432423422).

The spelling of 22221211200 in words is "twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, two hundred".