1121100 has 72 divisors (see below), whose sum is σ = 3364368. Its totient is φ = 288000.

The previous prime is 1121093. The next prime is 1121101. The reversal of 1121100 is 11211.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11050 + ... + 11150.

2^1121100 is an apocalyptic number.

1121100 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 1121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1682184).

1121100 is an abundant number, since it is smaller than the sum of its proper divisors (2243268).

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

1121100 is a wasteful number, since it uses less digits than its factorization.

1121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1121100 is about 1058.8200980337. The cubic root of 1121100 is about 103.8838693859.

Adding to 1121100 its reverse (11211), we get a palindrome (1132311).

Multiplying 1121100 by its reverse (11211), we get a square (12568652100 = 112110²).

1121100 divided by its reverse (11211) gives a square (100 = 10²).

It can be divided in two parts, 1121 and 100, that added together give a palindrome (1221).

The spelling of 1121100 in words is "one million, one hundred twenty-one thousand, one hundred".