1121111200 has 72 divisors (see below), whose sum is σ = 2985746400. Its totient is φ = 407673600.

The previous prime is 1121111161. The next prime is 1121111209. The reversal of 1121111200 is 21111211.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (1121111209) 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, 54900 + ... + 72499.

It is an arithmetic number, because the mean of its divisors is an integer number (41468700).

Almost surely, 2^1121111200 is an apocalyptic number.

1121111200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121111200 is an abundant number, since it is smaller than the sum of its proper divisors (1864635200).

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

1121111200 is a wasteful number, since it uses less digits than its factorization.

1121111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127430 (or 127417 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1121111200 is about 33482.9986709673. The cubic root of 1121111200 is about 1038.8421532457.

Adding to 1121111200 its reverse (21111211), we get a palindrome (1142222411).

It can be divided in two parts, 112111 and 1200, that added together give a palindrome (113311).

The spelling of 1121111200 in words is "one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred".