521321124613 has 4 divisors (see below), whose sum is σ = 548759078560. Its totient is φ = 493883170668.

The previous prime is 521321124563. The next prime is 521321124631. The reversal of 521321124613 is 316421123125.

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 a cyclic number.

It is not a de Polignac number, because 521321124613 - 2⁹ = 521321124101 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 (521321124673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13718976945 + ... + 13718976982.

It is an arithmetic number, because the mean of its divisors is an integer number (137189769640).

Almost surely, 2^521321124613 is an apocalyptic number.

It is an amenable number.

521321124613 is a deficient number, since it is larger than the sum of its proper divisors (27437953947).

521321124613 is a wasteful number, since it uses less digits than its factorization.

521321124613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27437953946.

The product of its digits is 8640, while the sum is 31.

Adding to 521321124613 its reverse (316421123125), we get a palindrome (837742247738).

The spelling of 521321124613 in words is "five hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-four thousand, six hundred thirteen".