213453403 has 4 divisors (see below), whose sum is σ = 213485328. Its totient is φ = 213421480.

The previous prime is 213453379. The next prime is 213453413. The reversal of 213453403 is 304354312.

213453403 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 213453403 - 2²¹ = 211356251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213453413) 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, 1663 + ... + 20728.

It is an arithmetic number, because the mean of its divisors is an integer number (53371332).

Almost surely, 2^213453403 is an apocalyptic number.

213453403 is a deficient number, since it is larger than the sum of its proper divisors (31925).

213453403 is an equidigital number, since it uses as much as digits as its factorization.

213453403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31924.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 213453403 is about 14610.0445926766. The cubic root of 213453403 is about 597.6327120112.

Subtracting 213453403 from its reverse (304354312), we obtain a palindrome (90900909).

The spelling of 213453403 in words is "two hundred thirteen million, four hundred fifty-three thousand, four hundred three".