213012320221 has 4 divisors (see below), whose sum is σ = 222273725472. Its totient is φ = 203750914972.

The previous prime is 213012320207. The next prime is 213012320233. The reversal of 213012320221 is 122023210312.

213012320221 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, 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 213012320221 - 2³⁷ = 75573366749 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 (213012320281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4630702591 + ... + 4630702636.

It is an arithmetic number, because the mean of its divisors is an integer number (55568431368).

Almost surely, 2^213012320221 is an apocalyptic number.

It is an amenable number.

213012320221 is a deficient number, since it is larger than the sum of its proper divisors (9261405251).

213012320221 is an equidigital number, since it uses as much as digits as its factorization.

213012320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9261405250.

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

Adding to 213012320221 its reverse (122023210312), we get a palindrome (335035530533).

The spelling of 213012320221 in words is "two hundred thirteen billion, twelve million, three hundred twenty thousand, two hundred twenty-one".