213324421 has 2 divisors, whose sum is σ = 213324422. Its totient is φ = 213324420.

The previous prime is 213324407. The next prime is 213324427. The reversal of 213324421 is 124423312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188073796 + 25250625 = 13714^2 + 5025^2 .

It is a cyclic number.

It is not a de Polignac number, because 213324421 - 2⁵ = 213324389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213324392 and 213324401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213324427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106662210 + 106662211.

It is an arithmetic number, because the mean of its divisors is an integer number (106662211).

Almost surely, 2^213324421 is an apocalyptic number.

It is an amenable number.

213324421 is a deficient number, since it is larger than the sum of its proper divisors (1).

213324421 is an equidigital number, since it uses as much as digits as its factorization.

213324421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 213324421 is about 14605.6297707425. The cubic root of 213324421 is about 597.5123119724.

Adding to 213324421 its reverse (124423312), we get a palindrome (337747733).

The spelling of 213324421 in words is "two hundred thirteen million, three hundred twenty-four thousand, four hundred twenty-one".