221303189 has 2 divisors, whose sum is σ = 221303190. Its totient is φ = 221303188.

The previous prime is 221303129. The next prime is 221303209. The reversal of 221303189 is 981303122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144600625 + 76702564 = 12025^2 + 8758^2 .

It is a cyclic number.

It is not a de Polignac number, because 221303189 - 2⁸ = 221302933 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 (221303129) 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, 110651594 + 110651595.

It is an arithmetic number, because the mean of its divisors is an integer number (110651595).

Almost surely, 2^221303189 is an apocalyptic number.

It is an amenable number.

221303189 is a deficient number, since it is larger than the sum of its proper divisors (1).

221303189 is an equidigital number, since it uses as much as digits as its factorization.

221303189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 221303189 is about 14876.2626018769. The cubic root of 221303189 is about 604.8707134434.

The spelling of 221303189 in words is "two hundred twenty-one million, three hundred three thousand, one hundred eighty-nine".