12310020221 has 4 divisors (see below), whose sum is σ = 12311768700. Its totient is φ = 12308271744.

The previous prime is 12310020209. The next prime is 12310020227. The reversal of 12310020221 is 12202001321.

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: 12202001321 = 197 ⋅61939093.

It can be written as a sum of positive squares in 2 ways, for example, as 5239732996 + 7070287225 = 72386^2 + 84085^2 .

It is a cyclic number.

It is not a de Polignac number, because 12310020221 - 2¹⁸ = 12309758077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12310020196 and 12310020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12310020227) 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, 863636 + ... + 877773.

It is an arithmetic number, because the mean of its divisors is an integer number (3077942175).

Almost surely, 2^12310020221 is an apocalyptic number.

It is an amenable number.

12310020221 is a deficient number, since it is larger than the sum of its proper divisors (1748479).

12310020221 is an equidigital number, since it uses as much as digits as its factorization.

12310020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748478.

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

Adding to 12310020221 its reverse (12202001321), we get a palindrome (24512021542).

The spelling of 12310020221 in words is "twelve billion, three hundred ten million, twenty thousand, two hundred twenty-one".