12331312220 has 12 divisors (see below), whose sum is σ = 25895755704. Its totient is φ = 4932524880.

The previous prime is 12331312211. The next prime is 12331312223. The reversal of 12331312220 is 2221313321.

It is a super-2 number, since 2×12331312220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 616565611 = 12331312220 / (1 + 2 + 3 + 3 + 1 + 3 + 1 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 12331312192 and 12331312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12331312223) 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, 308282786 + ... + 308282825.

It is an arithmetic number, because the mean of its divisors is an integer number (2157979642).

Almost surely, 2^12331312220 is an apocalyptic number.

12331312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12331312220 is an abundant number, since it is smaller than the sum of its proper divisors (13564443484).

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

12331312220 is a wasteful number, since it uses less digits than its factorization.

12331312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616565620 (or 616565618 counting only the distinct ones).

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

Adding to 12331312220 its reverse (2221313321), we get a palindrome (14552625541).

The spelling of 12331312220 in words is "twelve billion, three hundred thirty-one million, three hundred twelve thousand, two hundred twenty".