1121222200 has 48 divisors (see below), whose sum is σ = 2979251280. Its totient is φ = 384418560.

The previous prime is 1121222197. The next prime is 1121222209. The reversal of 1121222200 is 22221211.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121222209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399037 + ... + 401836.

It is an arithmetic number, because the mean of its divisors is an integer number (62067735).

Almost surely, 2^1121222200 is an apocalyptic number.

1121222200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121222200 is an abundant number, since it is smaller than the sum of its proper divisors (1858029080).

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

1121222200 is a wasteful number, since it uses less digits than its factorization.

1121222200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800896 (or 800887 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1121222200 is about 33484.6561875734. The cubic root of 1121222200 is about 1038.8764369914.

Adding to 1121222200 its reverse (22221211), we get a palindrome (1143443411).

The spelling of 1121222200 in words is "one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred".