12323131220 has 24 divisors (see below), whose sum is σ = 25920544104. Its totient is φ = 4921258496.

The previous prime is 12323131201. The next prime is 12323131313. The reversal of 12323131220 is 2213132321.

It can be written as a sum of positive squares in 4 ways, for example, as 1363972624 + 10959158596 = 36932^2 + 104686^2 .

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 = 12323131192 and 12323131201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486977 + ... + 511656.

It is an arithmetic number, because the mean of its divisors is an integer number (1080022671).

Almost surely, 2^12323131220 is an apocalyptic number.

12323131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12323131220 is an abundant number, since it is smaller than the sum of its proper divisors (13597412884).

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

12323131220 is a wasteful number, since it uses less digits than its factorization.

12323131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999259 (or 999257 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12323131220 its reverse (2213132321), we get a palindrome (14536263541).

It can be divided in two parts, 123231 and 31220, that added together give a palindrome (154451).

The spelling of 12323131220 in words is "twelve billion, three hundred twenty-three million, one hundred thirty-one thousand, two hundred twenty".