8502242721 has 64 divisors (see below), whose sum is σ = 14373089280. Its totient is φ = 4358534400.

The previous prime is 8502242719. The next prime is 8502242741. The reversal of 8502242721 is 1272422058.

It is not a de Polignac number, because 8502242721 - 2¹ = 8502242719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8502242741) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 922291 + ... + 931463.

It is an arithmetic number, because the mean of its divisors is an integer number (224579520).

Almost surely, 2^8502242721 is an apocalyptic number.

It is an amenable number.

8502242721 is a deficient number, since it is larger than the sum of its proper divisors (5870846559).

8502242721 is a wasteful number, since it uses less digits than its factorization.

8502242721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9326.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 8502242721 is about 92207.6066330756. The cubic root of 8502242721 is about 2041.0070256378.

Adding to 8502242721 its reverse (1272422058), we get a palindrome (9774664779).

The spelling of 8502242721 in words is "eight billion, five hundred two million, two hundred forty-two thousand, seven hundred twenty-one".