213571 has 6 divisors (see below), whose sum is σ = 227180. Its totient is φ = 200736.

The previous prime is 213557. The next prime is 213589. The reversal of 213571 is 175312.

213571 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 213571 - 2⁵ = 213539 is a prime.

It is a super-2 number, since 2×213571² = 91225144082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211571) 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 5 ways as a sum of consecutive naturals, for example, 81 + ... + 658.

2²¹³⁵⁷¹ is an apocalyptic number.

213571 is a deficient number, since it is larger than the sum of its proper divisors (13609).

213571 is an equidigital number, since it uses as much as digits as its factorization.

213571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773 (or 756 counting only the distinct ones).

The product of its digits is 210, while the sum is 19.

The square root of 213571 is about 462.1374254483. The cubic root of 213571 is about 59.7742442302.

Adding to 213571 its reverse (175312), we get a palindrome (388883).

It can be divided in two parts, 213 and 571, that added together give a square (784 = 28²).

The spelling of 213571 in words is "two hundred thirteen thousand, five hundred seventy-one".