12311023320 has 192 divisors, whose sum is σ = 41503587840. Its totient is φ = 3162240000.

The previous prime is 12311023313. The next prime is 12311023321. The reversal of 12311023320 is 2332011321.

12311023320 is a `hidden beast` number, since 1 + 231 + 102 + 332 + 0 = 666.

It is a super-2 number, since 2×12311023320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12311023293 and 12311023302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311023321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1340745 + ... + 1349895.

It is an arithmetic number, because the mean of its divisors is an integer number (216164520).

Almost surely, 2^12311023320 is an apocalyptic number.

12311023320 is a gapful number since it is divisible by the number (10) 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 12311023320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20751793920).

12311023320 is an abundant number, since it is smaller than the sum of its proper divisors (29192564520).

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

12311023320 is a wasteful number, since it uses less digits than its factorization.

12311023320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9306 (or 9299 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 12311023320 its reverse (2332011321), we get a palindrome (14643034641).

The spelling of 12311023320 in words is "twelve billion, three hundred eleven million, twenty-three thousand, three hundred twenty".