521200120 has 64 divisors (see below), whose sum is σ = 1345014720. Its totient is φ = 178059264.

The previous prime is 521200087. The next prime is 521200129. The reversal of 521200120 is 21002125.

It is a self number, because there is not a number n which added to its sum of digits gives 521200120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521200129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78864 + ... + 85216.

It is an arithmetic number, because the mean of its divisors is an integer number (21015855).

Almost surely, 2^521200120 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 521200120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672507360).

521200120 is an abundant number, since it is smaller than the sum of its proper divisors (823814600).

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

521200120 is a wasteful number, since it uses less digits than its factorization.

521200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6664 (or 6660 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 521200120 is about 22829.8077083448. The cubic root of 521200120 is about 804.7633114573.

Adding to 521200120 its reverse (21002125), we get a palindrome (542202245).

The spelling of 521200120 in words is "five hundred twenty-one million, two hundred thousand, one hundred twenty".