521321629980 has 24 divisors (see below), whose sum is σ = 1459700564112. Its totient is φ = 139019101312.

The previous prime is 521321629979. The next prime is 521321630003. The reversal of 521321629980 is 89926123125.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4344346857 + ... + 4344346976.

It is an arithmetic number, because the mean of its divisors is an integer number (60820856838).

Almost surely, 2^521321629980 is an apocalyptic number.

It is an amenable number.

521321629980 is an abundant number, since it is smaller than the sum of its proper divisors (938378934132).

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

521321629980 is a wasteful number, since it uses less digits than its factorization.

521321629980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8688693845 (or 8688693843 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 521321629980 in words is "five hundred twenty-one billion, three hundred twenty-one million, six hundred twenty-nine thousand, nine hundred eighty".