2311220000000 has 144 divisors (see below), whose sum is σ = 5766799885392. Its totient is φ = 924480000000.

The previous prime is 2311219999961. The next prime is 2311220000003. The reversal of 2311220000000 is 221132.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1112738058496 + 1198481941504 = 1054864^2 + 1094752^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311220000003) 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, 19942220 + ... + 20057780.

Almost surely, 2^{2311220000000} is an apocalyptic number.

2311220000000 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 2311220000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2883399942696).

2311220000000 is an abundant number, since it is smaller than the sum of its proper divisors (3455579885392).

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

2311220000000 is an frugal number, since it uses more digits than its factorization.

2311220000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115612 (or 115568 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 2311220000000 its reverse (221132), we get a palindrome (2311220221132).

The spelling of 2311220000000 in words is "two trillion, three hundred eleven billion, two hundred twenty million", and thus it is an aban number.