12320000021 has 8 divisors (see below), whose sum is σ = 14152954944. Its totient is φ = 10505283840.

The previous prime is 12319999997. The next prime is 12320000041. The reversal of 12320000021 is 12000002321.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12319999957 and 12320000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320000041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4558235 + ... + 4560936.

It is an arithmetic number, because the mean of its divisors is an integer number (1769119368).

Almost surely, 2^12320000021 is an apocalyptic number.

It is an amenable number.

12320000021 is a deficient number, since it is larger than the sum of its proper divisors (1832954923).

12320000021 is an equidigital number, since it uses as much as digits as its factorization.

12320000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119371.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 12320000021 its reverse (12000002321), we get a palindrome (24320002342).

The spelling of 12320000021 in words is "twelve billion, three hundred twenty million, twenty-one", and thus it is an aban number.