213573 has 4 divisors (see below), whose sum is σ = 284768. Its totient is φ = 142380.

The previous prime is 213557. The next prime is 213589. The reversal of 213573 is 375312.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (213557) and next prime (213589).

It is not a de Polignac number, because 213573 - 2⁴ = 213557 is a prime.

It is a super-2 number, since 2×213573² = 91226852658, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213573.

It is not an unprimeable number, because it can be changed into a prime (213523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35593 + ... + 35598.

It is an arithmetic number, because the mean of its divisors is an integer number (71192).

2²¹³⁵⁷³ is an apocalyptic number.

It is an amenable number.

213573 is a deficient number, since it is larger than the sum of its proper divisors (71195).

213573 is an equidigital number, since it uses as much as digits as its factorization.

213573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71194.

The product of its digits is 630, while the sum is 21.

The square root of 213573 is about 462.1395893018. The cubic root of 213573 is about 59.7744308162.

Adding to 213573 its reverse (375312), we get a palindrome (588885).

The spelling of 213573 in words is "two hundred thirteen thousand, five hundred seventy-three".