16025221 has 2 divisors, whose sum is σ = 16025222. Its totient is φ = 16025220.

The previous prime is 16025209. The next prime is 16025263. The reversal of 16025221 is 12252061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10962721 + 5062500 = 3311^2 + 2250^2 .

It is an emirp because it is prime and its reverse (12252061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16025221 - 2¹¹ = 16023173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16023221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8012610 + 8012611.

It is an arithmetic number, because the mean of its divisors is an integer number (8012611).

Almost surely, 2^16025221 is an apocalyptic number.

It is an amenable number.

16025221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16025221 is an equidigital number, since it uses as much as digits as its factorization.

16025221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 16025221 is about 4003.1513835977. The cubic root of 16025221 is about 252.1165424242.

Adding to 16025221 its reverse (12252061), we get a palindrome (28277282).

The spelling of 16025221 in words is "sixteen million, twenty-five thousand, two hundred twenty-one".