521020213 has 8 divisors (see below), whose sum is σ = 596502720. Its totient is φ = 445800480.

The previous prime is 521020189. The next prime is 521020217. The reversal of 521020213 is 312020125.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521020213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521020217) 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, 61423 + ... + 69388.

It is an arithmetic number, because the mean of its divisors is an integer number (74562840).

Almost surely, 2^521020213 is an apocalyptic number.

It is an amenable number.

521020213 is a deficient number, since it is larger than the sum of its proper divisors (75482507).

521020213 is a wasteful number, since it uses less digits than its factorization.

521020213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131387.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 521020213 is about 22825.8671905363. The cubic root of 521020213 is about 804.6707051760.

Adding to 521020213 its reverse (312020125), we get a palindrome (833040338).

The spelling of 521020213 in words is "five hundred twenty-one million, twenty thousand, two hundred thirteen".