16221275249 has 2 divisors, whose sum is σ = 16221275250. Its totient is φ = 16221275248.

The previous prime is 16221275201. The next prime is 16221275311. The reversal of 16221275249 is 94257212261.

16221275249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9669182224 + 6552093025 = 98332^2 + 80945^2 .

It is a cyclic number.

It is not a de Polignac number, because 16221275249 - 2¹² = 16221271153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16221275449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110637624 + 8110637625.

It is an arithmetic number, because the mean of its divisors is an integer number (8110637625).

Almost surely, 2^16221275249 is an apocalyptic number.

It is an amenable number.

16221275249 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221275249 is an equidigital number, since it uses as much as digits as its factorization.

16221275249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The spelling of 16221275249 in words is "sixteen billion, two hundred twenty-one million, two hundred seventy-five thousand, two hundred forty-nine".