213313521 has 8 divisors (see below), whose sum is σ = 286494624. Its totient is φ = 141170720.

The previous prime is 213313517. The next prime is 213313567. The reversal of 213313521 is 125313312.

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 213313521 - 2² = 213313517 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213313571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259095 + ... + 259916.

It is an arithmetic number, because the mean of its divisors is an integer number (35811828).

Almost surely, 2^213313521 is an apocalyptic number.

It is an amenable number.

213313521 is a deficient number, since it is larger than the sum of its proper divisors (73181103).

213313521 is a wasteful number, since it uses less digits than its factorization.

213313521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519151.

The product of its digits is 540, while the sum is 21.

The square root of 213313521 is about 14605.2566221891. The cubic root of 213313521 is about 597.5021349923.

Adding to 213313521 its reverse (125313312), we get a palindrome (338626833).

The spelling of 213313521 in words is "two hundred thirteen million, three hundred thirteen thousand, five hundred twenty-one".