221121222200 has 24 divisors (see below), whose sum is σ = 514106842080. Its totient is φ = 88448488800.

The previous prime is 221121222173. The next prime is 221121222221. The reversal of 221121222200 is 2222121122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 552802856 + ... + 552803255.

It is an arithmetic number, because the mean of its divisors is an integer number (21421118420).

Almost surely, 2^221121222200 is an apocalyptic number.

221121222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121222200 is an abundant number, since it is smaller than the sum of its proper divisors (292985619880).

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

221121222200 is a wasteful number, since it uses less digits than its factorization.

221121222200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105606127 (or 1105606118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221121222200 its reverse (2222121122), we get a palindrome (223343343322).

The spelling of 221121222200 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred".