213404473 has 4 divisors (see below), whose sum is σ = 213435648. Its totient is φ = 213373300.

The previous prime is 213404459. The next prime is 213404497. The reversal of 213404473 is 374404312.

213404473 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 213404473 - 2⁹ = 213403961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213404423) 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, 361 + ... + 20662.

It is an arithmetic number, because the mean of its divisors is an integer number (53358912).

Almost surely, 2^213404473 is an apocalyptic number.

It is an amenable number.

213404473 is a deficient number, since it is larger than the sum of its proper divisors (31175).

213404473 is a wasteful number, since it uses less digits than its factorization.

213404473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31174.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 213404473 is about 14608.3699638255. The cubic root of 213404473 is about 597.5870433346.

Adding to 213404473 its reverse (374404312), we get a palindrome (587808785).

The spelling of 213404473 in words is "two hundred thirteen million, four hundred four thousand, four hundred seventy-three".