213245 has 4 divisors (see below), whose sum is σ = 255900. Its totient is φ = 170592.

The previous prime is 213229. The next prime is 213247. The reversal of 213245 is 542312.

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 103684 + 109561 = 322^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 213245 - 2⁴ = 213229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213247) 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, 21320 + ... + 21329.

It is an arithmetic number, because the mean of its divisors is an integer number (63975).

2²¹³²⁴⁵ is an apocalyptic number.

It is an amenable number.

213245 is a deficient number, since it is larger than the sum of its proper divisors (42655).

213245 is an equidigital number, since it uses as much as digits as its factorization.

213245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42654.

The product of its digits is 240, while the sum is 17.

The square root of 213245 is about 461.7845818128. The cubic root of 213245 is about 59.7438151193.

Adding to 213245 its reverse (542312), we get a palindrome (755557).

The spelling of 213245 in words is "two hundred thirteen thousand, two hundred forty-five".