521391321827712 has 192 divisors, whose sum is σ = 1804941763123200. Its totient is φ = 141128478047232.

The previous prime is 521391321827699. The next prime is 521391321827749. The reversal of 521391321827712 is 217728123193125.

521391321827712 is a `hidden beast` number, since 5 + 2 + 1 + 39 + 1 + 321 + 8 + 277 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×521391321827712² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1701337888 + ... + 1701644319.

It is an arithmetic number, because the mean of its divisors is an integer number (9400738349600).

Almost surely, 2^{521391321827712} is an apocalyptic number.

It is an amenable number.

521391321827712 is an abundant number, since it is smaller than the sum of its proper divisors (1283550441295488).

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

521391321827712 is a wasteful number, since it uses less digits than its factorization.

521391321827712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402982253 (or 3402982238 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 521391321827712 in words is "five hundred twenty-one trillion, three hundred ninety-one billion, three hundred twenty-one million, eight hundred twenty-seven thousand, seven hundred twelve".