213313233221 has 4 divisors (see below), whose sum is σ = 232705345344. Its totient is φ = 193921121100.

The previous prime is 213313233191. The next prime is 213313233227. The reversal of 213313233221 is 122332313312.

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 a de Polignac number, because none of the positive numbers 2^k-213313233221 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 (213313233227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9696056045 + ... + 9696056066.

It is an arithmetic number, because the mean of its divisors is an integer number (58176336336).

Almost surely, 2^213313233221 is an apocalyptic number.

It is an amenable number.

213313233221 is a deficient number, since it is larger than the sum of its proper divisors (19392112123).

213313233221 is a wasteful number, since it uses less digits than its factorization.

213313233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19392112122.

The product of its digits is 3888, while the sum is 26.

Adding to 213313233221 its reverse (122332313312), we get a palindrome (335645546533).

The spelling of 213313233221 in words is "two hundred thirteen billion, three hundred thirteen million, two hundred thirty-three thousand, two hundred twenty-one".