12427982221 has 2 divisors, whose sum is σ = 12427982222. Its totient is φ = 12427982220.

The previous prime is 12427982167. The next prime is 12427982257. The reversal of 12427982221 is 12228972421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12357657225 + 70324996 = 111165^2 + 8386^2 .

It is a cyclic number.

It is not a de Polignac number, because 12427982221 - 2²⁷ = 12293764493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12427982521) 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 as a sum of consecutive naturals, namely, 6213991110 + 6213991111.

It is an arithmetic number, because the mean of its divisors is an integer number (6213991111).

Almost surely, 2^12427982221 is an apocalyptic number.

It is an amenable number.

12427982221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12427982221 is an equidigital number, since it uses as much as digits as its factorization.

12427982221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The spelling of 12427982221 in words is "twelve billion, four hundred twenty-seven million, nine hundred eighty-two thousand, two hundred twenty-one".