521541223213 has 8 divisors (see below), whose sum is σ = 522490523832. Its totient is φ = 520592080896.

The previous prime is 521541223207. The next prime is 521541223241. The reversal of 521541223213 is 312322145125.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 292634475849 + 228906747364 = 540957^2 + 478442^2 .

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 521541223213 - 2¹³ = 521541215021 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 (521541223013) 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, 8043981 + ... + 8108557.

It is an arithmetic number, because the mean of its divisors is an integer number (65311315479).

Almost surely, 2^521541223213 is an apocalyptic number.

It is an amenable number.

521541223213 is a deficient number, since it is larger than the sum of its proper divisors (949300619).

521541223213 is a wasteful number, since it uses less digits than its factorization.

521541223213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79151.

The product of its digits is 14400, while the sum is 31.

Adding to 521541223213 its reverse (312322145125), we get a palindrome (833863368338).

The spelling of 521541223213 in words is "five hundred twenty-one billion, five hundred forty-one million, two hundred twenty-three thousand, two hundred thirteen".