1121212222200 has 960 divisors, whose sum is σ = 4620175718400. Its totient is φ = 246598732800.

The previous prime is 1121212222199. The next prime is 1121212222237. The reversal of 1121212222200 is 22222121211.

It is a happy number.

1121212222200 is a `hidden beast` number, since 11 + 21 + 212 + 222 + 200 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 239 ways as a sum of consecutive naturals, for example, 692532991 + ... + 692534609.

It is an arithmetic number, because the mean of its divisors is an integer number (4812683040).

Almost surely, 2^{1121212222200} is an apocalyptic number.

1121212222200 is a gapful number since it is divisible by the number (10) 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 1121212222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2310087859200).

1121212222200 is an abundant number, since it is smaller than the sum of its proper divisors (3498963496200).

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

1121212222200 is a wasteful number, since it uses less digits than its factorization.

1121212222200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882 (or 1864 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1121212222200 its reverse (22222121211), we get a palindrome (1143434343411).

The spelling of 1121212222200 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred".