11121111000 has 256 divisors, whose sum is σ = 40822704000. Its totient is φ = 2791065600.

The previous prime is 11121110929. The next prime is 11121111011. The reversal of 11121111000 is 11112111.

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 63 ways as a sum of consecutive naturals, for example, 446886 + ... + 471114.

Almost surely, 2^11121111000 is an apocalyptic number.

11121111000 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 11121111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20411352000).

11121111000 is an abundant number, since it is smaller than the sum of its proper divisors (29701593000).

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

11121111000 is a wasteful number, since it uses less digits than its factorization.

11121111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24276 (or 24256 counting only the distinct ones).

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

Adding to 11121111000 its reverse (11112111), we get a palindrome (11132223111).

It can be divided in two parts, 1112111 and 1000, that added together give a palindrome (1113111).

The spelling of 11121111000 in words is "eleven billion, one hundred twenty-one million, one hundred eleven thousand".