213421565 has 8 divisors (see below), whose sum is σ = 292692480. Its totient is φ = 146346192.

The previous prime is 213421543. The next prime is 213421567. The reversal of 213421565 is 565124312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213421565 - 2¹² = 213417469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213421567) 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 7 ways as a sum of consecutive naturals, for example, 3048845 + ... + 3048914.

It is an arithmetic number, because the mean of its divisors is an integer number (36586560).

Almost surely, 2^213421565 is an apocalyptic number.

It is an amenable number.

213421565 is a deficient number, since it is larger than the sum of its proper divisors (79270915).

213421565 is an equidigital number, since it uses as much as digits as its factorization.

213421565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6097771.

The product of its digits is 7200, while the sum is 29.

The square root of 213421565 is about 14608.9549592022. The cubic root of 213421565 is about 597.6029968975.

Adding to 213421565 its reverse (565124312), we get a palindrome (778545877).

The spelling of 213421565 in words is "two hundred thirteen million, four hundred twenty-one thousand, five hundred sixty-five".