521321134413 has 4 divisors (see below), whose sum is σ = 695094845888. Its totient is φ = 347547422940.

The previous prime is 521321134387. The next prime is 521321134427. The reversal of 521321134413 is 314431123125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 521321134413 - 2³² = 517026167117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521321134483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86886855733 + ... + 86886855738.

It is an arithmetic number, because the mean of its divisors is an integer number (173773711472).

Almost surely, 2^521321134413 is an apocalyptic number.

It is an amenable number.

521321134413 is a deficient number, since it is larger than the sum of its proper divisors (173773711475).

521321134413 is a wasteful number, since it uses less digits than its factorization.

521321134413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173773711474.

The product of its digits is 8640, while the sum is 30.

Adding to 521321134413 its reverse (314431123125), we get a palindrome (835752257538).

The spelling of 521321134413 in words is "five hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-four thousand, four hundred thirteen".