12123004431 has 4 divisors (see below), whose sum is σ = 16164005912. Its totient is φ = 8082002952.

The previous prime is 12123004403. The next prime is 12123004457. The reversal of 12123004431 is 13440032121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13440032121 = 3 ⋅4480010707.

It is not a de Polignac number, because 12123004431 - 2⁷ = 12123004303 is a prime.

It is a super-2 number, since 2×12123004431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123004398 and 12123004407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123004631) 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, 2020500736 + ... + 2020500741.

It is an arithmetic number, because the mean of its divisors is an integer number (4041001478).

Almost surely, 2^12123004431 is an apocalyptic number.

12123004431 is a deficient number, since it is larger than the sum of its proper divisors (4041001481).

12123004431 is an equidigital number, since it uses as much as digits as its factorization.

12123004431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041001480.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 12123004431 its reverse (13440032121), we get a palindrome (25563036552).

The spelling of 12123004431 in words is "twelve billion, one hundred twenty-three million, four thousand, four hundred thirty-one".