213308521 has 8 divisors (see below), whose sum is σ = 218196104. Its totient is φ = 208465920.

The previous prime is 213308519. The next prime is 213308533. The reversal of 213308521 is 125803312.

It can be written as a sum of positive squares in 4 ways, for example, as 30085225 + 183223296 = 5485^2 + 13536^2 .

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 213308521 - 2¹ = 213308519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213108521) 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, 1560 + ... + 20713.

It is an arithmetic number, because the mean of its divisors is an integer number (27274513).

Almost surely, 2^213308521 is an apocalyptic number.

It is an amenable number.

213308521 is a deficient number, since it is larger than the sum of its proper divisors (4887583).

213308521 is a wasteful number, since it uses less digits than its factorization.

213308521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22491.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 213308521 is about 14605.0854499383. The cubic root of 213308521 is about 597.4974665369.

The spelling of 213308521 in words is "two hundred thirteen million, three hundred eight thousand, five hundred twenty-one".