213424233221 has 4 divisors (see below), whose sum is σ = 213885193152. Its totient is φ = 212963273292.

The previous prime is 213424233199. The next prime is 213424233259. The reversal of 213424233221 is 122332424312.

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 213424233221 - 2³⁴ = 196244364037 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 (213424233521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230479271 + ... + 230480196.

It is an arithmetic number, because the mean of its divisors is an integer number (53471298288).

Almost surely, 2^213424233221 is an apocalyptic number.

It is an amenable number.

213424233221 is a deficient number, since it is larger than the sum of its proper divisors (460959931).

213424233221 is an equidigital number, since it uses as much as digits as its factorization.

213424233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460959930.

The product of its digits is 13824, while the sum is 29.

Adding to 213424233221 its reverse (122332424312), we get a palindrome (335756657533).

The spelling of 213424233221 in words is "two hundred thirteen billion, four hundred twenty-four million, two hundred thirty-three thousand, two hundred twenty-one".