213473 has 4 divisors (see below), whose sum is σ = 229908. Its totient is φ = 197040.

The previous prime is 213467. The next prime is 213481. The reversal of 213473 is 374312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12769 + 200704 = 113^2 + 448^2 .

It is a cyclic number.

It is not a de Polignac number, because 213473 - 2⁸ = 213217 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (213173) 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, 8198 + ... + 8223.

It is an arithmetic number, because the mean of its divisors is an integer number (57477).

2²¹³⁴⁷³ is an apocalyptic number.

It is an amenable number.

213473 is a deficient number, since it is larger than the sum of its proper divisors (16435).

213473 is a wasteful number, since it uses less digits than its factorization.

213473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16434.

The product of its digits is 504, while the sum is 20.

The square root of 213473 is about 462.0313842154. The cubic root of 213473 is about 59.7651000858.

Adding to 213473 its reverse (374312), we get a palindrome (587785).

It can be divided in two parts, 213 and 473, that added together give a palindrome (686).

The spelling of 213473 in words is "two hundred thirteen thousand, four hundred seventy-three".