213000221 has 4 divisors (see below), whose sum is σ = 243428832. Its totient is φ = 182571612.

The previous prime is 213000211. The next prime is 213000239. The reversal of 213000221 is 122000312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213000221 - 2¹⁰ = 212999197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213000211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15214295 + ... + 15214308.

It is an arithmetic number, because the mean of its divisors is an integer number (60857208).

Almost surely, 2^213000221 is an apocalyptic number.

It is an amenable number.

213000221 is a deficient number, since it is larger than the sum of its proper divisors (30428611).

213000221 is an equidigital number, since it uses as much as digits as its factorization.

213000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30428610.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 213000221 is about 14594.5270906597. The cubic root of 213000221 is about 597.2094685291.

Adding to 213000221 its reverse (122000312), we get a palindrome (335000533).

Subtracting from 213000221 its reverse (122000312), we obtain a palindrome (90999909).

The spelling of 213000221 in words is "two hundred thirteen million, two hundred twenty-one", and thus it is an aban number.