213671 has 4 divisors (see below), whose sum is σ = 216672. Its totient is φ = 210672.

The previous prime is 213659. The next prime is 213713. The reversal of 213671 is 176312.

It is a happy number.

213671 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 a de Polignac number, because none of the positive numbers 2^k-213671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213611) 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, 1391 + ... + 1536.

It is an arithmetic number, because the mean of its divisors is an integer number (54168).

2²¹³⁶⁷¹ is an apocalyptic number.

213671 is a deficient number, since it is larger than the sum of its proper divisors (3001).

213671 is an equidigital number, since it uses as much as digits as its factorization.

213671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000.

The product of its digits is 252, while the sum is 20.

The square root of 213671 is about 462.2456057119. The cubic root of 213671 is about 59.7835721066.

Adding to 213671 its reverse (176312), we get a palindrome (389983).

The spelling of 213671 in words is "two hundred thirteen thousand, six hundred seventy-one".