52521577721 has 8 divisors (see below), whose sum is σ = 53127623304. Its totient is φ = 51917219200.

The previous prime is 52521577709. The next prime is 52521577729. The reversal of 52521577721 is 12777512525.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17529760000 + 34991817721 = 132400^2 + 187061^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 52521577721 - 2¹⁰ = 52521576697 is a prime.

It is a super-2 number, since 2×52521577721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (52521577729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359090 + ... + 483723.

It is an arithmetic number, because the mean of its divisors is an integer number (6640952913).

Almost surely, 2^52521577721 is an apocalyptic number.

It is an amenable number.

52521577721 is a deficient number, since it is larger than the sum of its proper divisors (606045583).

52521577721 is a wasteful number, since it uses less digits than its factorization.

52521577721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843531.

The product of its digits is 343000, while the sum is 44.

The spelling of 52521577721 in words is "fifty-two billion, five hundred twenty-one million, five hundred seventy-seven thousand, seven hundred twenty-one".