12306244221 has 20 divisors (see below), whose sum is σ = 19017315900. Its totient is φ = 7921259136.

The previous prime is 12306244213. The next prime is 12306244241. The reversal of 12306244221 is 12244260321.

12306244221 is a `hidden beast` number, since 1 + 2 + 30 + 624 + 4 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3496356900 + 8809887321 = 59130^2 + 93861^2 .

It is not a de Polignac number, because 12306244221 - 2³ = 12306244213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12306244241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2617116 + ... + 2621813.

It is an arithmetic number, because the mean of its divisors is an integer number (950865795).

Almost surely, 2^12306244221 is an apocalyptic number.

It is an amenable number.

12306244221 is a deficient number, since it is larger than the sum of its proper divisors (6711071679).

12306244221 is an equidigital number, since it uses as much as digits as its factorization.

12306244221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5238970 (or 5238961 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The spelling of 12306244221 in words is "twelve billion, three hundred six million, two hundred forty-four thousand, two hundred twenty-one".