213521020565 has 16 divisors (see below), whose sum is σ = 256903349760. Its totient is φ = 170364904320.

The previous prime is 213521020549. The next prime is 213521020679. The reversal of 213521020565 is 565020125312.

It is not a de Polignac number, because 213521020565 - 2⁴ = 213521020549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16531460 + ... + 16544370.

It is an arithmetic number, because the mean of its divisors is an integer number (16056459360).

Almost surely, 2^213521020565 is an apocalyptic number.

It is an amenable number.

213521020565 is a deficient number, since it is larger than the sum of its proper divisors (43382329195).

213521020565 is a wasteful number, since it uses less digits than its factorization.

213521020565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21412.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 213521020565 its reverse (565020125312), we get a palindrome (778541145877).

The spelling of 213521020565 in words is "two hundred thirteen billion, five hundred twenty-one million, twenty thousand, five hundred sixty-five".