213403 has 4 divisors (see below), whose sum is σ = 217080. Its totient is φ = 209728.

The previous prime is 213397. The next prime is 213407. The reversal of 213403 is 304312.

213403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213403 - 2¹³ = 205211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750 + ... + 1867.

It is an arithmetic number, because the mean of its divisors is an integer number (54270).

2²¹³⁴⁰³ is an apocalyptic number.

213403 is a deficient number, since it is larger than the sum of its proper divisors (3677).

213403 is an equidigital number, since it uses as much as digits as its factorization.

213403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 213403 is about 461.9556255746. The cubic root of 213403 is about 59.7585668406.

Adding to 213403 its reverse (304312), we get a palindrome (517715).

Subtracting 213403 from its reverse (304312), we obtain a palindrome (90909).

It can be divided in two parts, 213 and 403, that added together give a palindrome (616).

The spelling of 213403 in words is "two hundred thirteen thousand, four hundred three".