1121111100 has 216 divisors, whose sum is σ = 3650735088. Its totient is φ = 287539200.

The previous prime is 1121111083. The next prime is 1121111111. The reversal of 1121111100 is 11111211.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4362172 + ... + 4362428.

Almost surely, 2^1121111100 is an apocalyptic number.

1121111100 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 1121111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1825367544).

1121111100 is an abundant number, since it is smaller than the sum of its proper divisors (2529623988).

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

1121111100 is a wasteful number, since it uses less digits than its factorization.

1121111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 1121111100 is about 33482.9971776721. The cubic root of 1121111100 is about 1038.8421223585.

Adding to 1121111100 its reverse (11111211), we get a palindrome (1132222311).

It can be divided in two parts, 1121111 and 100, that added together give a palindrome (1121211).

The spelling of 1121111100 in words is "one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred".