1111121100 has 216 divisors, whose sum is σ = 3642159248. Its totient is φ = 283046400.

The previous prime is 1111121087. The next prime is 1111121113. The reversal of 1111121100 is 11211111.

It is an interprime number because it is at equal distance from previous prime (1111121087) and next prime (1111121113).

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

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, 2031027 + ... + 2031573.

Almost surely, 2^1111121100 is an apocalyptic number.

1111121100 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 1111121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1821079624).

1111121100 is an abundant number, since it is smaller than the sum of its proper divisors (2531038148).

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

1111121100 is a wasteful number, since it uses less digits than its factorization.

1111121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 655 counting only the distinct ones).

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

The square root of 1111121100 is about 33333.4831663299. The cubic root of 1111121100 is about 1035.7472724220.

Adding to 1111121100 its reverse (11211111), we get a palindrome (1122332211).

It can be divided in two parts, 111 and 1121100, that added together give a palindrome (1121211).

The spelling of 1111121100 in words is "one billion, one hundred eleven million, one hundred twenty-one thousand, one hundred".