1123321320 has 192 divisors, whose sum is σ = 3999378240. Its totient is φ = 271180800.

The previous prime is 1123321319. The next prime is 1123321337. The reversal of 1123321320 is 231233211.

1123321320 is a `hidden beast` number, since 1 + 1 + 23 + 321 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1123321293 and 1123321302.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1310332 + ... + 1311188.

It is an arithmetic number, because the mean of its divisors is an integer number (20830095).

Almost surely, 2^1123321320 is an apocalyptic number.

1123321320 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 1123321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1999689120).

1123321320 is an abundant number, since it is smaller than the sum of its proper divisors (2876056920).

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

1123321320 is a wasteful number, since it uses less digits than its factorization.

1123321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1123321320 is about 33515.9860365170. The cubic root of 1123321320 is about 1039.5243510333.

Adding to 1123321320 its reverse (231233211), we get a palindrome (1354554531).

The spelling of 1123321320 in words is "one billion, one hundred twenty-three million, three hundred twenty-one thousand, three hundred twenty".