52440221521 has 16 divisors (see below), whose sum is σ = 58466923200. Its totient is φ = 46742151168.

The previous prime is 52440221461. The next prime is 52440221549. The reversal of 52440221521 is 12512204425.

It is a happy number.

52440221521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 52440221521 - 2¹⁵ = 52440188753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52440221521.

It is not an unprimeable number, because it can be changed into a prime (52440221621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 995985 + ... + 1047313.

It is an arithmetic number, because the mean of its divisors is an integer number (3654182700).

Almost surely, 2^52440221521 is an apocalyptic number.

It is an amenable number.

52440221521 is a deficient number, since it is larger than the sum of its proper divisors (6026701679).

52440221521 is a wasteful number, since it uses less digits than its factorization.

52440221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54528.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 52440221521 its reverse (12512204425), we get a palindrome (64952425946).

The spelling of 52440221521 in words is "fifty-two billion, four hundred forty million, two hundred twenty-one thousand, five hundred twenty-one".