21684946317024 has 96 divisors (see below), whose sum is σ = 60274336792320. Its totient is φ = 6802788349952.

The previous prime is 21684946316963. The next prime is 21684946317053. The reversal of 21684946317024 is 42071364948612.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34250437 + ... + 34877819.

It is an arithmetic number, because the mean of its divisors is an integer number (627857674920).

Almost surely, 2^{21684946317024} is an apocalyptic number.

21684946317024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21684946317024 is an abundant number, since it is smaller than the sum of its proper divisors (38589390475296).

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

21684946317024 is a wasteful number, since it uses less digits than its factorization.

21684946317024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648592 (or 648584 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 57.

The spelling of 21684946317024 in words is "twenty-one trillion, six hundred eighty-four billion, nine hundred forty-six million, three hundred seventeen thousand, twenty-four".