213204403 has 2 divisors, whose sum is σ = 213204404. Its totient is φ = 213204402.

The previous prime is 213204389. The next prime is 213204413. The reversal of 213204403 is 304402312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213204403 - 2⁵ = 213204371 is a prime.

It is a super-3 number, since 3×213204403³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (213204413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106602201 + 106602202.

It is an arithmetic number, because the mean of its divisors is an integer number (106602202).

Almost surely, 2^213204403 is an apocalyptic number.

213204403 is a deficient number, since it is larger than the sum of its proper divisors (1).

213204403 is an equidigital number, since it uses as much as digits as its factorization.

213204403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 213204403 is about 14601.5205715021. The cubic root of 213204403 is about 597.4002359067.

Adding to 213204403 its reverse (304402312), we get a palindrome (517606715).

The spelling of 213204403 in words is "two hundred thirteen million, two hundred four thousand, four hundred three".