522521220 has 96 divisors (see below), whose sum is σ = 1614130560. Its totient is φ = 125475840.

The previous prime is 522521201. The next prime is 522521221. The reversal of 522521220 is 22125225.

It is not an unprimeable number, because it can be changed into a prime (522521221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23811 + ... + 40149.

It is an arithmetic number, because the mean of its divisors is an integer number (16813860).

Almost surely, 2^522521220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 522521220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (807065280).

522521220 is an abundant number, since it is smaller than the sum of its proper divisors (1091609340).

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

522521220 is a wasteful number, since it uses less digits than its factorization.

522521220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16405 (or 16403 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 522521220 is about 22858.7230614486. The cubic root of 522521220 is about 805.4426895238.

Adding to 522521220 its reverse (22125225), we get a palindrome (544646445).

The spelling of 522521220 in words is "five hundred twenty-two million, five hundred twenty-one thousand, two hundred twenty".