213241321 has 4 divisors (see below), whose sum is σ = 220594500. Its totient is φ = 205888144.

The previous prime is 213241291. The next prime is 213241337. The reversal of 213241321 is 123142312.

It is a happy number.

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 91470096 + 121771225 = 9564^2 + 11035^2 .

It is a cyclic number.

It is not a de Polignac number, because 213241321 - 2¹⁵ = 213208553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213241361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3676546 + ... + 3676603.

It is an arithmetic number, because the mean of its divisors is an integer number (55148625).

Almost surely, 2^213241321 is an apocalyptic number.

It is an amenable number.

213241321 is a deficient number, since it is larger than the sum of its proper divisors (7353179).

213241321 is an equidigital number, since it uses as much as digits as its factorization.

213241321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7353178.

The product of its digits is 288, while the sum is 19.

The square root of 213241321 is about 14602.7847001865. The cubic root of 213241321 is about 597.4347154151.

Adding to 213241321 its reverse (123142312), we get a palindrome (336383633).

Subtracting from 213241321 its reverse (123142312), we obtain a palindrome (90099009).

The spelling of 213241321 in words is "two hundred thirteen million, two hundred forty-one thousand, three hundred twenty-one".