52405841721 has 8 divisors (see below), whose sum is σ = 70424648704. Its totient is φ = 34662131280.

The previous prime is 52405841693. The next prime is 52405841731. The reversal of 52405841721 is 12714850425.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-52405841721 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 52405841721.

It is not an unprimeable number, because it can be changed into a prime (52405841731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68773690 + ... + 68774451.

It is an arithmetic number, because the mean of its divisors is an integer number (8803081088).

Almost surely, 2^52405841721 is an apocalyptic number.

It is an amenable number.

52405841721 is a deficient number, since it is larger than the sum of its proper divisors (18018806983).

52405841721 is a wasteful number, since it uses less digits than its factorization.

52405841721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137548271.

The product of its (nonzero) digits is 89600, while the sum is 39.

The spelling of 52405841721 in words is "fifty-two billion, four hundred five million, eight hundred forty-one thousand, seven hundred twenty-one".