12123131320 has 16 divisors (see below), whose sum is σ = 27277045560. Its totient is φ = 4849252512.

The previous prime is 12123131291. The next prime is 12123131369. The reversal of 12123131320 is 2313132121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151539102 + ... + 151539181.

Almost surely, 2^12123131320 is an apocalyptic number.

12123131320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123131320 is an abundant number, since it is smaller than the sum of its proper divisors (15153914240).

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

12123131320 is a wasteful number, since it uses less digits than its factorization.

12123131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303078294 (or 303078290 counting only the distinct ones).

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

Adding to 12123131320 its reverse (2313132121), we get a palindrome (14436263441).

The spelling of 12123131320 in words is "twelve billion, one hundred twenty-three million, one hundred thirty-one thousand, three hundred twenty".