1123311220 has 24 divisors (see below), whose sum is σ = 2370816000. Its totient is φ = 447064992.

The previous prime is 1123311187. The next prime is 1123311221. The reversal of 1123311220 is 221133211.

It is a junction number, because it is equal to n+sod(n) for n = 1123311194 and 1123311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123311221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137140 + ... + 145099.

It is an arithmetic number, because the mean of its divisors is an integer number (98784000).

Almost surely, 2^1123311220 is an apocalyptic number.

1123311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123311220 is an abundant number, since it is smaller than the sum of its proper divisors (1247504780).

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

1123311220 is a wasteful number, since it uses less digits than its factorization.

1123311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282447 (or 282445 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1123311220 is about 33515.8353618107. The cubic root of 1123311220 is about 1039.5212355022.

Adding to 1123311220 its reverse (221133211), we get a palindrome (1344444431).

The spelling of 1123311220 in words is "one billion, one hundred twenty-three million, three hundred eleven thousand, two hundred twenty".