210404213 has 4 divisors (see below), whose sum is σ = 210450240. Its totient is φ = 210358188.

The previous prime is 210404197. The next prime is 210404219. The reversal of 210404213 is 312404012.

Added to its reverse (312404012) it gives a square (522808225 = 22865²).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210404213 - 2⁴ = 210404197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210404191 and 210404200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210404219) 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 in 3 ways as a sum of consecutive naturals, for example, 15293 + ... + 25586.

It is an arithmetic number, because the mean of its divisors is an integer number (52612560).

Almost surely, 2^210404213 is an apocalyptic number.

It is an amenable number.

210404213 is a deficient number, since it is larger than the sum of its proper divisors (46027).

210404213 is an equidigital number, since it uses as much as digits as its factorization.

210404213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46026.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 210404213 is about 14505.3167149153. The cubic root of 210404213 is about 594.7733175996.

Adding to 210404213 its reverse (312404012), we get a palindrome (522808225).

The spelling of 210404213 in words is "two hundred ten million, four hundred four thousand, two hundred thirteen".