403343221 has 2 divisors, whose sum is σ = 403343222. Its totient is φ = 403343220.

The previous prime is 403343219. The next prime is 403343233. The reversal of 403343221 is 122343304.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398002500 + 5340721 = 19950^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 403343221 - 2¹ = 403343219 is a prime.

Together with 403343219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 403343192 and 403343201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403343251) 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, 201671610 + 201671611.

It is an arithmetic number, because the mean of its divisors is an integer number (201671611).

Almost surely, 2^403343221 is an apocalyptic number.

It is an amenable number.

403343221 is a deficient number, since it is larger than the sum of its proper divisors (1).

403343221 is an equidigital number, since it uses as much as digits as its factorization.

403343221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 403343221 is about 20083.4066084417. The cubic root of 403343221 is about 738.8533623696.

Adding to 403343221 its reverse (122343304), we get a palindrome (525686525).

The spelling of 403343221 in words is "four hundred three million, three hundred forty-three thousand, two hundred twenty-one".