221040353 has 2 divisors, whose sum is σ = 221040354. Its totient is φ = 221040352.

The previous prime is 221040301. The next prime is 221040359. The reversal of 221040353 is 353040122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183683809 + 37356544 = 13553^2 + 6112^2 .

It is a cyclic number.

It is not a de Polignac number, because 221040353 - 2¹⁸ = 220778209 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221040359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110520176 + 110520177.

It is an arithmetic number, because the mean of its divisors is an integer number (110520177).

Almost surely, 2^221040353 is an apocalyptic number.

It is an amenable number.

221040353 is a deficient number, since it is larger than the sum of its proper divisors (1).

221040353 is an equidigital number, since it uses as much as digits as its factorization.

221040353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 221040353 is about 14867.4259036324. The cubic root of 221040353 is about 604.6311555461.

Adding to 221040353 its reverse (353040122), we get a palindrome (574080475).

The spelling of 221040353 in words is "two hundred twenty-one million, forty thousand, three hundred fifty-three".