12321220001 has 4 divisors (see below), whose sum is σ = 12621737604. Its totient is φ = 12020702400.

The previous prime is 12321219947. The next prime is 12321220027. The reversal of 12321220001 is 10002212321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10002212321 = 859 ⋅11644019.

It can be written as a sum of positive squares in 2 ways, for example, as 3095809600 + 9225410401 = 55640^2 + 96049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12321220001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12321220091) 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, 150258740 + ... + 150258821.

It is an arithmetic number, because the mean of its divisors is an integer number (3155434401).

Almost surely, 2^12321220001 is an apocalyptic number.

It is an amenable number.

12321220001 is a deficient number, since it is larger than the sum of its proper divisors (300517603).

12321220001 is an equidigital number, since it uses as much as digits as its factorization.

12321220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300517602.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12321220001 its reverse (10002212321), we get a palindrome (22323432322).

The spelling of 12321220001 in words is "twelve billion, three hundred twenty-one million, two hundred twenty thousand, one".