8201052721 has 4 divisors (see below), whose sum is σ = 8230238244. Its totient is φ = 8171867200.

The previous prime is 8201052667. The next prime is 8201052731. The reversal of 8201052721 is 1272501028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2510010000 + 5691042721 = 50100^2 + 75439^2 .

It is a cyclic number.

It is not a de Polignac number, because 8201052721 - 2¹³ = 8201044529 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 8201052721.

It is not an unprimeable number, because it can be changed into a prime (8201052731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14592340 + ... + 14592901.

It is an arithmetic number, because the mean of its divisors is an integer number (2057559561).

Almost surely, 2^8201052721 is an apocalyptic number.

It is an amenable number.

8201052721 is a deficient number, since it is larger than the sum of its proper divisors (29185523).

8201052721 is a wasteful number, since it uses less digits than its factorization.

8201052721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29185522.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 8201052721 is about 90559.6638741554. The cubic root of 8201052721 is about 2016.6159659620.

Adding to 8201052721 its reverse (1272501028), we get a palindrome (9473553749).

The spelling of 8201052721 in words is "eight billion, two hundred one million, fifty-two thousand, seven hundred twenty-one".