12123012321 has 12 divisors (see below), whose sum is σ = 20012591872. Its totient is φ = 6927435576.

The previous prime is 12123012313. The next prime is 12123012359. The reversal of 12123012321 is 12321032121.

It is not a de Polignac number, because 12123012321 - 2³ = 12123012313 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12123012294 and 12123012303.

It is not an unprimeable number, because it can be changed into a prime (12123012311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96214321 + ... + 96214446.

Almost surely, 2^12123012321 is an apocalyptic number.

It is an amenable number.

12123012321 is a deficient number, since it is larger than the sum of its proper divisors (7889579551).

12123012321 is a wasteful number, since it uses less digits than its factorization.

12123012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192428780 (or 192428777 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12123012321 its reverse (12321032121), we get a palindrome (24444044442).

The spelling of 12123012321 in words is "twelve billion, one hundred twenty-three million, twelve thousand, three hundred twenty-one".