2311211231320 has 128 divisors (see below), whose sum is σ = 5458150656000. Its totient is φ = 879115184640.

The previous prime is 2311211231317. The next prime is 2311211231387. The reversal of 2311211231320 is 231321121132.

It is a junction number, because it is equal to n+sod(n) for n = 2311211231291 and 2311211231300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136097230 + ... + 136114210.

It is an arithmetic number, because the mean of its divisors is an integer number (42641802000).

Almost surely, 2^{2311211231320} is an apocalyptic number.

2311211231320 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 2311211231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2729075328000).

2311211231320 is an abundant number, since it is smaller than the sum of its proper divisors (3146939424680).

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

2311211231320 is a wasteful number, since it uses less digits than its factorization.

2311211231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17873 (or 17869 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2311211231320 its reverse (231321121132), we get a palindrome (2542532352452).

The spelling of 2311211231320 in words is "two trillion, three hundred eleven billion, two hundred eleven million, two hundred thirty-one thousand, three hundred twenty".