521521321441 has 4 divisors (see below), whose sum is σ = 522942360832. Its totient is φ = 520100282052.

The previous prime is 521521321393. The next prime is 521521321459. The reversal of 521521321441 is 144123125125.

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 521521321441 - 2⁷ = 521521321313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521521327441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710519145 + ... + 710519878.

It is an arithmetic number, because the mean of its divisors is an integer number (130735590208).

Almost surely, 2^521521321441 is an apocalyptic number.

It is an amenable number.

521521321441 is a deficient number, since it is larger than the sum of its proper divisors (1421039391).

521521321441 is a wasteful number, since it uses less digits than its factorization.

521521321441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421039390.

The product of its digits is 9600, while the sum is 31.

Adding to 521521321441 its reverse (144123125125), we get a palindrome (665644446566).

The spelling of 521521321441 in words is "five hundred twenty-one billion, five hundred twenty-one million, three hundred twenty-one thousand, four hundred forty-one".