213423321 has 24 divisors (see below), whose sum is σ = 304052800. Its totient is φ = 133132032.

The previous prime is 213423307. The next prime is 213423347. The reversal of 213423321 is 123324312.

213423321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213423321 - 2⁹ = 213422809 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (213423361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171915 + ... + 173151.

Almost surely, 2^213423321 is an apocalyptic number.

It is an amenable number.

213423321 is a deficient number, since it is larger than the sum of its proper divisors (90629479).

213423321 is a wasteful number, since it uses less digits than its factorization.

213423321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473 (or 1456 counting only the distinct ones).

The product of its digits is 864, while the sum is 21.

The square root of 213423321 is about 14609.0150592023. The cubic root of 213423321 is about 597.6046358884.

Adding to 213423321 its reverse (123324312), we get a palindrome (336747633).

Subtracting from 213423321 its reverse (123324312), we obtain a palindrome (90099009).

The spelling of 213423321 in words is "two hundred thirteen million, four hundred twenty-three thousand, three hundred twenty-one".