21504300656032 has 48 divisors (see below), whose sum is σ = 43710681756672. Its totient is φ = 10407305018880.

The previous prime is 21504300656021. The next prime is 21504300656107. The reversal of 21504300656032 is 23065600340512.

It is a junction number, because it is equal to n+sod(n) for n = 21504300655982 and 21504300656000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64362798 + ... + 64696045.

It is an arithmetic number, because the mean of its divisors is an integer number (910639203264).

Almost surely, 2^{21504300656032} is an apocalyptic number.

It is an amenable number.

21504300656032 is an abundant number, since it is smaller than the sum of its proper divisors (22206381100640).

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

21504300656032 is a wasteful number, since it uses less digits than its factorization.

21504300656032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129059021 (or 129059013 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 21504300656032 its reverse (23065600340512), we get a palindrome (44569900996544).

The spelling of 21504300656032 in words is "twenty-one trillion, five hundred four billion, three hundred million, six hundred fifty-six thousand, thirty-two".