3111321220 has 96 divisors (see below), whose sum is σ = 7558387200. Its totient is φ = 1053803520.

The previous prime is 3111321149. The next prime is 3111321221. The reversal of 3111321220 is 221231113.

It is a junction number, because it is equal to n+sod(n) for n = 3111321194 and 3111321203.

It is not an unprimeable number, because it can be changed into a prime (3111321221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5042352 + ... + 5042968.

It is an arithmetic number, because the mean of its divisors is an integer number (78733200).

Almost surely, 2^3111321220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3111321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3779193600).

3111321220 is an abundant number, since it is smaller than the sum of its proper divisors (4447065980).

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

3111321220 is a wasteful number, since it uses less digits than its factorization.

3111321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013 (or 1011 counting only the distinct ones).

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

The square root of 3111321220 is about 55779.2185316360. The cubic root of 3111321220 is about 1459.8725759812.

Adding to 3111321220 its reverse (221231113), we get a palindrome (3332552333).

The spelling of 3111321220 in words is "three billion, one hundred eleven million, three hundred twenty-one thousand, two hundred twenty".