16221061 has 2 divisors, whose sum is σ = 16221062. Its totient is φ = 16221060.

The previous prime is 16221031. The next prime is 16221089. The reversal of 16221061 is 16012261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15444900 + 776161 = 3930^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 16221061 - 2⁹ = 16220549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110530 + 8110531.

It is an arithmetic number, because the mean of its divisors is an integer number (8110531).

Almost surely, 2^16221061 is an apocalyptic number.

It is an amenable number.

16221061 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221061 is an equidigital number, since it uses as much as digits as its factorization.

16221061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 16221061 is about 4027.5378334660. The cubic root of 16221061 is about 253.1394035598.

The spelling of 16221061 in words is "sixteen million, two hundred twenty-one thousand, sixty-one".