213313421 has 4 divisors (see below), whose sum is σ = 213986652. Its totient is φ = 212640192.

The previous prime is 213313417. The next prime is 213313427. The reversal of 213313421 is 124313312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 200788900 = 3539^2 + 14170^2 .

It is a cyclic number.

It is not a de Polignac number, because 213313421 - 2² = 213313417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213313393 and 213313402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213313427) 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, 336140 + ... + 336773.

It is an arithmetic number, because the mean of its divisors is an integer number (53496663).

Almost surely, 2^213313421 is an apocalyptic number.

It is an amenable number.

213313421 is a deficient number, since it is larger than the sum of its proper divisors (673231).

213313421 is an equidigital number, since it uses as much as digits as its factorization.

213313421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673230.

The product of its digits is 432, while the sum is 20.

The square root of 213313421 is about 14605.2531987638. The cubic root of 213313421 is about 597.5020416239.

Adding to 213313421 its reverse (124313312), we get a palindrome (337626733).

The spelling of 213313421 in words is "two hundred thirteen million, three hundred thirteen thousand, four hundred twenty-one".