12228046821 has 10 divisors (see below), whose sum is σ = 18266588582. Its totient is φ = 8152031160.

The previous prime is 12228046819. The next prime is 12228046849. The reversal of 12228046821 is 12864082221.

It can be written as a sum of positive squares in only one way, i.e., 8683630596 + 3544416225 = 93186^2 + 59535^2 .

It is not a de Polignac number, because 12228046821 - 2¹ = 12228046819 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12228046811) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 75481690 + ... + 75481851.

Almost surely, 2^12228046821 is an apocalyptic number.

It is an amenable number.

12228046821 is a deficient number, since it is larger than the sum of its proper divisors (6038541761).

12228046821 is an equidigital number, since it uses as much as digits as its factorization.

12228046821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150963553 (or 150963544 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 12228046821 in words is "twelve billion, two hundred twenty-eight million, forty-six thousand, eight hundred twenty-one".