213130321 has 4 divisors (see below), whose sum is σ = 213189172. Its totient is φ = 213071472.

The previous prime is 213130303. The next prime is 213130327. The reversal of 213130321 is 123031312.

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 71639296 + 141491025 = 8464^2 + 11895^2 .

It is a cyclic number.

It is not a de Polignac number, because 213130321 - 2²⁵ = 179575889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213130295 and 213130304.

It is not an unprimeable number, because it can be changed into a prime (213130327) 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, 23610 + ... + 31363.

It is an arithmetic number, because the mean of its divisors is an integer number (53297293).

Almost surely, 2^213130321 is an apocalyptic number.

It is an amenable number.

213130321 is a deficient number, since it is larger than the sum of its proper divisors (58851).

213130321 is an equidigital number, since it uses as much as digits as its factorization.

213130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58850.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213130321 is about 14598.9835605086. The cubic root of 213130321 is about 597.3310351294.

Adding to 213130321 its reverse (123031312), we get a palindrome (336161633).

Subtracting from 213130321 its reverse (123031312), we obtain a palindrome (90099009).

The spelling of 213130321 in words is "two hundred thirteen million, one hundred thirty thousand, three hundred twenty-one".