2311112220 has 96 divisors (see below), whose sum is σ = 6796113408. Its totient is φ = 585691392.

The previous prime is 2311112201. The next prime is 2311112233. The reversal of 2311112220 is 222111132.

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 2311112220.

It is a congruent number.

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, 211327 + ... + 221993.

It is an arithmetic number, because the mean of its divisors is an integer number (70792848).

Almost surely, 2^2311112220 is an apocalyptic number.

2311112220 is a gapful number since it is divisible by the number (20) 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 2311112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3398056704).

2311112220 is an abundant number, since it is smaller than the sum of its proper divisors (4485001188).

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

2311112220 is a wasteful number, since it uses less digits than its factorization.

2311112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10859 (or 10857 counting only the distinct ones).

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

The square root of 2311112220 is about 48074.0285393267. The cubic root of 2311112220 is about 1322.1285332429.

Adding to 2311112220 its reverse (222111132), we get a palindrome (2533223352).

The spelling of 2311112220 in words is "two billion, three hundred eleven million, one hundred twelve thousand, two hundred twenty".