22121111200 has 72 divisors (see below), whose sum is σ = 54159471072. Its totient is φ = 8822833920.

The previous prime is 22121111197. The next prime is 22121111239. The reversal of 22121111200 is 211112122.

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, 237757 + ... + 317443.

It is an arithmetic number, because the mean of its divisors is an integer number (752214876).

Almost surely, 2^22121111200 is an apocalyptic number.

22121111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22121111200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27079735536).

22121111200 is an abundant number, since it is smaller than the sum of its proper divisors (32038359872).

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

22121111200 is a wasteful number, since it uses less digits than its factorization.

22121111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80054 (or 80041 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 22121111200 its reverse (211112122), we get a palindrome (22332223322).

The spelling of 22121111200 in words is "twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred".