1123121100 has 36 divisors (see below), whose sum is σ = 3249564584. Its totient is φ = 299498880.

The previous prime is 1123121063. The next prime is 1123121101. The reversal of 1123121100 is 11213211.

It is a super-2 number, since 2×1123121100² = 2522802010530420000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1123121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1871569 + ... + 1872168.

Almost surely, 2^1123121100 is an apocalyptic number.

1123121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123121100 is an abundant number, since it is smaller than the sum of its proper divisors (2126443484).

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

1123121100 is a wasteful number, since it uses less digits than its factorization.

1123121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3743754 (or 3743747 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1123121100 is about 33512.9989705487. The cubic root of 1123121100 is about 1039.4625860010.

Adding to 1123121100 its reverse (11213211), we get a palindrome (1134334311).

The spelling of 1123121100 in words is "one billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred".