12123231131 has 8 divisors (see below), whose sum is σ = 14003304624. Its totient is φ = 10372817920.

The previous prime is 12123231121. The next prime is 12123231157. The reversal of 12123231131 is 13113232121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12123231131 - 2³⁰ = 11049489307 is a prime.

It is a super-2 number, since 2×12123231131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12123231121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32414870 + ... + 32415243.

It is an arithmetic number, because the mean of its divisors is an integer number (1750413078).

Almost surely, 2^12123231131 is an apocalyptic number.

12123231131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12123231131 is a deficient number, since it is larger than the sum of its proper divisors (1880073493).

12123231131 is a wasteful number, since it uses less digits than its factorization.

12123231131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64830141.

The product of its digits is 216, while the sum is 20.

Adding to 12123231131 its reverse (13113232121), we get a palindrome (25236463252).

The spelling of 12123231131 in words is "twelve billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred thirty-one".