521320520000 has 140 divisors (see below), whose sum is σ = 1477378462560. Its totient is φ = 178738368000.

The previous prime is 521320519991. The next prime is 521320520011. The reversal of 521320520000 is 25023125.

It is a tau number, because it is divible by the number of its divisors (140).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 650930 + ... + 1210929.

It is an arithmetic number, because the mean of its divisors is an integer number (10552703304).

Almost surely, 2^521320520000 is an apocalyptic number.

521320520000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

521320520000 is an abundant number, since it is smaller than the sum of its proper divisors (956057942560).

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

521320520000 is an equidigital number, since it uses as much as digits as its factorization.

521320520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861898 (or 1861873 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 521320520000 its reverse (25023125), we get a palindrome (521345543125).

The spelling of 521320520000 in words is "five hundred twenty-one billion, three hundred twenty million, five hundred twenty thousand".