12123231130 has 32 divisors (see below), whose sum is σ = 22275172368. Its totient is φ = 4748889600.

The previous prime is 12123231121. The next prime is 12123231157. The reversal of 12123231130 is 3113232121.

It can be written as a sum of positive squares in 8 ways, for example, as 9549393841 + 2573837289 = 97721^2 + 50733^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12123231098 and 12123231107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265590 + ... + 307870.

Almost surely, 2^12123231130 is an apocalyptic number.

12123231130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12123231130 is a deficient number, since it is larger than the sum of its proper divisors (10151941238).

12123231130 is a wasteful number, since it uses less digits than its factorization.

12123231130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42882.

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

Adding to 12123231130 its reverse (3113232121), we get a palindrome (15236463251).

Subtracting from 12123231130 its reverse (3113232121), we obtain a palindrome (9009999009).

It can be divided in two parts, 12123 and 231130, that added together give a triangular number (243253 = T₆₉₇).

The spelling of 12123231130 in words is "twelve billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred thirty".