521210220 has 48 divisors (see below), whose sum is σ = 1462177248. Its totient is φ = 138723840.

The previous prime is 521210177. The next prime is 521210227. The reversal of 521210220 is 22012125.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 521210220.

It is not an unprimeable number, because it can be changed into a prime (521210227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24432 + ... + 40488.

It is an arithmetic number, because the mean of its divisors is an integer number (30462026).

Almost surely, 2^521210220 is an apocalyptic number.

It is an amenable number.

521210220 is an abundant number, since it is smaller than the sum of its proper divisors (940967028).

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

521210220 is a wasteful number, since it uses less digits than its factorization.

521210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16610 (or 16608 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 521210220 is about 22830.0289093115. The cubic root of 521210220 is about 804.7685097530.

Adding to 521210220 its reverse (22012125), we get a palindrome (543222345).

The spelling of 521210220 in words is "five hundred twenty-one million, two hundred ten thousand, two hundred twenty".