12313121320 has 16 divisors (see below), whose sum is σ = 27704523060. Its totient is φ = 4925248512.

The previous prime is 12313121311. The next prime is 12313121321. The reversal of 12313121320 is 2312131321.

It can be written as a sum of positive squares in 2 ways, for example, as 12239881956 + 73239364 = 110634^2 + 8558^2 .

It is a super-2 number, since 2×12313121320² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12313121321) 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, 153913977 + ... + 153914056.

Almost surely, 2^12313121320 is an apocalyptic number.

12313121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12313121320 is an abundant number, since it is smaller than the sum of its proper divisors (15391401740).

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

12313121320 is a wasteful number, since it uses less digits than its factorization.

12313121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307828044 (or 307828040 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12313121320 its reverse (2312131321), we get a palindrome (14625252641).

The spelling of 12313121320 in words is "twelve billion, three hundred thirteen million, one hundred twenty-one thousand, three hundred twenty".