213443221 has 8 divisors (see below), whose sum is σ = 215076800. Its totient is φ = 211815648.

The previous prime is 213443203. The next prime is 213443233. The reversal of 213443221 is 122344312.

213443221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213443221 - 2⁵ = 213443189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213443192 and 213443201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213443261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89770 + ... + 92116.

It is an arithmetic number, because the mean of its divisors is an integer number (26884600).

Almost surely, 2^213443221 is an apocalyptic number.

It is an amenable number.

213443221 is a deficient number, since it is larger than the sum of its proper divisors (1633579).

213443221 is a wasteful number, since it uses less digits than its factorization.

213443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003.

The product of its digits is 1152, while the sum is 22.

The square root of 213443221 is about 14609.6961296257. The cubic root of 213443221 is about 597.6232092455.

Adding to 213443221 its reverse (122344312), we get a palindrome (335787533).

The spelling of 213443221 in words is "two hundred thirteen million, four hundred forty-three thousand, two hundred twenty-one".