12210442421 has 2 divisors, whose sum is σ = 12210442422. Its totient is φ = 12210442420.

The previous prime is 12210442379. The next prime is 12210442441. The reversal of 12210442421 is 12424401221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8192784196 + 4017658225 = 90514^2 + 63385^2 .

It is a cyclic number.

It is not a de Polignac number, because 12210442421 - 2⁶ = 12210442357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12210442441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105221210 + 6105221211.

It is an arithmetic number, because the mean of its divisors is an integer number (6105221211).

Almost surely, 2^12210442421 is an apocalyptic number.

It is an amenable number.

12210442421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12210442421 is an equidigital number, since it uses as much as digits as its factorization.

12210442421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 12210442421 its reverse (12424401221), we get a palindrome (24634843642).

The spelling of 12210442421 in words is "twelve billion, two hundred ten million, four hundred forty-two thousand, four hundred twenty-one".