213221313221 has 4 divisors (see below), whose sum is σ = 243681500832. Its totient is φ = 182761125612.

The previous prime is 213221313191. The next prime is 213221313223. The reversal of 213221313221 is 122313122312.

213221313221 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 213221313221 - 2¹⁰ = 213221312197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221313223) 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, 15230093795 + ... + 15230093808.

It is an arithmetic number, because the mean of its divisors is an integer number (60920375208).

Almost surely, 2^213221313221 is an apocalyptic number.

It is an amenable number.

213221313221 is a deficient number, since it is larger than the sum of its proper divisors (30460187611).

213221313221 is an equidigital number, since it uses as much as digits as its factorization.

213221313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30460187610.

The product of its digits is 864, while the sum is 23.

Adding to 213221313221 its reverse (122313122312), we get a palindrome (335534435533).

The spelling of 213221313221 in words is "two hundred thirteen billion, two hundred twenty-one million, three hundred thirteen thousand, two hundred twenty-one".