521302120 has 16 divisors (see below), whose sum is σ = 1172929860. Its totient is φ = 208520832.

The previous prime is 521302099. The next prime is 521302129. The reversal of 521302120 is 21203125.

It can be written as a sum of positive squares in 2 ways, for example, as 464057764 + 57244356 = 21542^2 + 7566^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521302094 and 521302103.

It is not an unprimeable number, because it can be changed into a prime (521302129) 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 3 ways as a sum of consecutive naturals, for example, 6516237 + ... + 6516316.

Almost surely, 2^521302120 is an apocalyptic number.

It is an amenable number.

521302120 is an abundant number, since it is smaller than the sum of its proper divisors (651627740).

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

521302120 is a wasteful number, since it uses less digits than its factorization.

521302120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13032564 (or 13032560 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 521302120 is about 22832.0415206350. The cubic root of 521302120 is about 804.8158060114.

Adding to 521302120 its reverse (21203125), we get a palindrome (542505245).

The spelling of 521302120 in words is "five hundred twenty-one million, three hundred two thousand, one hundred twenty".