12312222320 has 20 divisors (see below), whose sum is σ = 28625917080. Its totient is φ = 4924888896.

The previous prime is 12312222313. The next prime is 12312222323. The reversal of 12312222320 is 2322221321.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12312222292 and 12312222301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312222323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76951310 + ... + 76951469.

It is an arithmetic number, because the mean of its divisors is an integer number (1431295854).

Almost surely, 2^12312222320 is an apocalyptic number.

12312222320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12312222320 is an abundant number, since it is smaller than the sum of its proper divisors (16313694760).

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

12312222320 is a wasteful number, since it uses less digits than its factorization.

12312222320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153902792 (or 153902786 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 12312222320 its reverse (2322221321), we get a palindrome (14634443641).

Subtracting from 12312222320 its reverse (2322221321), we obtain a palindrome (9990000999).

The spelling of 12312222320 in words is "twelve billion, three hundred twelve million, two hundred twenty-two thousand, three hundred twenty".