213434321 has 2 divisors, whose sum is σ = 213434322. Its totient is φ = 213434320.

The previous prime is 213434297. The next prime is 213434323. The reversal of 213434321 is 123434312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176358400 + 37075921 = 13280^2 + 6089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213434321 is a prime.

Together with 213434323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213434323) 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 as a sum of consecutive naturals, namely, 106717160 + 106717161.

It is an arithmetic number, because the mean of its divisors is an integer number (106717161).

Almost surely, 2^213434321 is an apocalyptic number.

It is an amenable number.

213434321 is a deficient number, since it is larger than the sum of its proper divisors (1).

213434321 is an equidigital number, since it uses as much as digits as its factorization.

213434321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 23.

The square root of 213434321 is about 14609.3915342152. The cubic root of 213434321 is about 597.6149027109.

Adding to 213434321 its reverse (123434312), we get a palindrome (336868633).

Subtracting from 213434321 its reverse (123434312), we obtain a palindrome (90000009).

The spelling of 213434321 in words is "two hundred thirteen million, four hundred thirty-four thousand, three hundred twenty-one".