3111222120 has 128 divisors (see below), whose sum is σ = 9492387840. Its totient is φ = 815673600.

The previous prime is 3111222083. The next prime is 3111222131. The reversal of 3111222120 is 212221113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 3111222120.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1865527 + ... + 1867193.

It is an arithmetic number, because the mean of its divisors is an integer number (74159280).

Almost surely, 2^3111222120 is an apocalyptic number.

3111222120 is a gapful number since it is divisible by the number (30) 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 3111222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4746193920).

3111222120 is an abundant number, since it is smaller than the sum of its proper divisors (6381165720).

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

3111222120 is a wasteful number, since it uses less digits than its factorization.

3111222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935 (or 1931 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 3111222120 is about 55778.3302008943. The cubic root of 3111222120 is about 1459.8570761449.

Adding to 3111222120 its reverse (212221113), we get a palindrome (3323443233).

The spelling of 3111222120 in words is "three billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty".