213230221 has 4 divisors (see below), whose sum is σ = 213356700. Its totient is φ = 213103744.

The previous prime is 213230219. The next prime is 213230261. The reversal of 213230221 is 122032312.

213230221 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 can be written as a sum of positive squares in 2 ways, for example, as 85766121 + 127464100 = 9261^2 + 11290^2 .

It is a cyclic number.

It is not a de Polignac number, because 213230221 - 2¹ = 213230219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213230195 and 213230204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213230261) 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, 60676 + ... + 64093.

It is an arithmetic number, because the mean of its divisors is an integer number (53339175).

Almost surely, 2^213230221 is an apocalyptic number.

It is an amenable number.

213230221 is a deficient number, since it is larger than the sum of its proper divisors (126479).

213230221 is a wasteful number, since it uses less digits than its factorization.

213230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126478.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 213230221 is about 14602.4046307449. The cubic root of 213230221 is about 597.4243490059.

Adding to 213230221 its reverse (122032312), we get a palindrome (335262533).

The spelling of 213230221 in words is "two hundred thirteen million, two hundred thirty thousand, two hundred twenty-one".