213220310021 has 4 divisors (see below), whose sum is σ = 213221536044. Its totient is φ = 213219084000.

The previous prime is 213220309999. The next prime is 213220310041. The reversal of 213220310021 is 120013022312.

213220310021 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 97085212225 + 116135097796 = 311585^2 + 340786^2 .

It is a cyclic number.

It is not a de Polignac number, because 213220310021 - 2¹⁰ = 213220308997 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 (213220310041) 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, 298280 + ... + 717921.

It is an arithmetic number, because the mean of its divisors is an integer number (53305384011).

Almost surely, 2^213220310021 is an apocalyptic number.

It is an amenable number.

213220310021 is a deficient number, since it is larger than the sum of its proper divisors (1226023).

213220310021 is a wasteful number, since it uses less digits than its factorization.

213220310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226022.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 213220310021 its reverse (120013022312), we get a palindrome (333233332333).

The spelling of 213220310021 in words is "two hundred thirteen billion, two hundred twenty million, three hundred ten thousand, twenty-one".