521673252120 has 160 divisors (see below), whose sum is σ = 1755572631120. Its totient is φ = 138940634880.

The previous prime is 521673252077. The next prime is 521673252169. The reversal of 521673252120 is 21252376125.

521673252120 is a `hidden beast` number, since 5 + 21 + 67 + 32 + 521 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 39 ways as a sum of consecutive naturals, for example, 2528374 + ... + 2726906.

Almost surely, 2^521673252120 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 521673252120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (877786315560).

521673252120 is an abundant number, since it is smaller than the sum of its proper divisors (1233899379000).

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

521673252120 is a wasteful number, since it uses less digits than its factorization.

521673252120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199367 (or 199354 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 521673252120 in words is "five hundred twenty-one billion, six hundred seventy-three million, two hundred fifty-two thousand, one hundred twenty".