521444525121 has 12 divisors (see below), whose sum is σ = 811135928148. Its totient is φ = 320888938464.

The previous prime is 521444525089. The next prime is 521444525143. The reversal of 521444525121 is 121525444125.

521444525121 is a `hidden beast` number, since 5 + 2 + 1 + 4 + 4 + 4 + 525 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 357079148721 + 164365376400 = 597561^2 + 405420^2 .

It is not a de Polignac number, because 521444525121 - 2⁵ = 521444525089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521444523121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2228395290 + ... + 2228395523.

It is an arithmetic number, because the mean of its divisors is an integer number (67594660679).

Almost surely, 2^521444525121 is an apocalyptic number.

It is an amenable number.

521444525121 is a deficient number, since it is larger than the sum of its proper divisors (289691403027).

521444525121 is a wasteful number, since it uses less digits than its factorization.

521444525121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4456790832 (or 4456790829 counting only the distinct ones).

The product of its digits is 64000, while the sum is 36.

Adding to 521444525121 its reverse (121525444125), we get a palindrome (642969969246).

The spelling of 521444525121 in words is "five hundred twenty-one billion, four hundred forty-four million, five hundred twenty-five thousand, one hundred twenty-one".