22221121221200 has 120 divisors (see below), whose sum is σ = 58816168890336. Its totient is φ = 8000403520000.

The previous prime is 22221121221157. The next prime is 22221121221227. The reversal of 22221121221200 is 212212112222.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24556862 + ... + 25445661.

Almost surely, 2^{22221121221200} is an apocalyptic number.

22221121221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221121221200 is an abundant number, since it is smaller than the sum of its proper divisors (36595047669136).

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

22221121221200 is a wasteful number, since it uses less digits than its factorization.

22221121221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50002653 (or 50002642 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22221121221200 its reverse (212212112222), we get a palindrome (22433333333422).

The spelling of 22221121221200 in words is "twenty-two trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred".