12321103021 has 4 divisors (see below), whose sum is σ = 12321901600. Its totient is φ = 12320304444.

The previous prime is 12321103001. The next prime is 12321103027. The reversal of 12321103021 is 12030112321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12030112321 = 103 ⋅116797207.

It is a cyclic number.

It is not a de Polignac number, because 12321103021 - 2¹⁵ = 12321070253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12321102986 and 12321103004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321103027) 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 3 ways as a sum of consecutive naturals, for example, 375681 + ... + 407158.

It is an arithmetic number, because the mean of its divisors is an integer number (3080475400).

Almost surely, 2^12321103021 is an apocalyptic number.

It is an amenable number.

12321103021 is a deficient number, since it is larger than the sum of its proper divisors (798579).

12321103021 is an equidigital number, since it uses as much as digits as its factorization.

12321103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798578.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12321103021 its reverse (12030112321), we get a palindrome (24351215342).

The spelling of 12321103021 in words is "twelve billion, three hundred twenty-one million, one hundred three thousand, twenty-one".