16925221 has 2 divisors, whose sum is σ = 16925222. Its totient is φ = 16925220.

The previous prime is 16925203. The next prime is 16925267. The reversal of 16925221 is 12252961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 225 = 4114^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 16925221 - 2⁷ = 16925093 is a prime.

It is a super-4 number, since 4×16925221⁴ (a number of 30 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16925221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16925281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8462610 + 8462611.

It is an arithmetic number, because the mean of its divisors is an integer number (8462611).

Almost surely, 2^16925221 is an apocalyptic number.

It is an amenable number.

16925221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16925221 is an equidigital number, since it uses as much as digits as its factorization.

16925221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 16925221 is about 4114.0273455581. The cubic root of 16925221 is about 256.7505894866.

The spelling of 16925221 in words is "sixteen million, nine hundred twenty-five thousand, two hundred twenty-one".