521221160 has 32 divisors (see below), whose sum is σ = 1180231560. Its totient is φ = 207158016.

The previous prime is 521221157. The next prime is 521221171. The reversal of 521221160 is 61122125.

It can be written as a sum of positive squares in 4 ways, for example, as 405055876 + 116165284 = 20126^2 + 10778^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35219 + ... + 47778.

Almost surely, 2^521221160 is an apocalyptic number.

It is an amenable number.

521221160 is an abundant number, since it is smaller than the sum of its proper divisors (659010400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521221160 is a wasteful number, since it uses less digits than its factorization.

521221160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83165 (or 83161 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 521221160 is about 22830.2685047723. The cubic root of 521221160 is about 804.7741403064.

Adding to 521221160 its reverse (61122125), we get a palindrome (582343285).

The spelling of 521221160 in words is "five hundred twenty-one million, two hundred twenty-one thousand, one hundred sixty".