1323111220 has 48 divisors (see below), whose sum is σ = 2824069248. Its totient is φ = 520640640.

The previous prime is 1323111191. The next prime is 1323111221. The reversal of 1323111220 is 221113231.

It is a junction number, because it is equal to n+sod(n) for n = 1323111194 and 1323111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323111221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321375 + ... + 325465.

It is an arithmetic number, because the mean of its divisors is an integer number (58834776).

Almost surely, 2^1323111220 is an apocalyptic number.

1323111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323111220 is an abundant number, since it is smaller than the sum of its proper divisors (1500958028).

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

1323111220 is a wasteful number, since it uses less digits than its factorization.

1323111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4360 (or 4358 counting only the distinct ones).

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

The square root of 1323111220 is about 36374.5958053145. The cubic root of 1323111220 is about 1097.8224746529.

Adding to 1323111220 its reverse (221113231), we get a palindrome (1544224451).

The spelling of 1323111220 in words is "one billion, three hundred twenty-three million, one hundred eleven thousand, two hundred twenty".