521421799680 has 216 divisors, whose sum is σ = 1805548268160. Its totient is φ = 138931507200.

The previous prime is 521421799669. The next prime is 521421799697. The reversal of 521421799680 is 86997124125.

It is a happy number.

521421799680 is a `hidden beast` number, since 52 + 1 + 421 + 7 + 9 + 96 + 80 = 666.

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, 14485705 + ... + 14521655.

It is an arithmetic number, because the mean of its divisors is an integer number (8359019760).

Almost surely, 2^521421799680 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 521421799680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902774134080).

521421799680 is an abundant number, since it is smaller than the sum of its proper divisors (1284126468480).

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

521421799680 is a wasteful number, since it uses less digits than its factorization.

521421799680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37237 (or 37220 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 521421799680 in words is "five hundred twenty-one billion, four hundred twenty-one million, seven hundred ninety-nine thousand, six hundred eighty".