521321053 has 4 divisors (see below), whose sum is σ = 568713888. Its totient is φ = 473928220.

The previous prime is 521321041. The next prime is 521321077. The reversal of 521321053 is 350123125.

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 521321053 - 2²⁵ = 487766621 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 (521321033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23696401 + ... + 23696422.

It is an arithmetic number, because the mean of its divisors is an integer number (142178472).

Almost surely, 2^521321053 is an apocalyptic number.

It is an amenable number.

521321053 is a deficient number, since it is larger than the sum of its proper divisors (47392835).

521321053 is a wasteful number, since it uses less digits than its factorization.

521321053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47392834.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 521321053 is about 22832.4561315685. The cubic root of 521321053 is about 804.8255491735.

Adding to 521321053 its reverse (350123125), we get a palindrome (871444178).

The spelling of 521321053 in words is "five hundred twenty-one million, three hundred twenty-one thousand, fifty-three".