21652405644016 has 40 divisors (see below), whose sum is σ = 47945889815264. Its totient is φ = 9279355196160.

The previous prime is 21652405644013. The next prime is 21652405644047. The reversal of 21652405644016 is 61044650425612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652405644013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1678726 + ... + 6791386.

Almost surely, 2^{21652405644016} is an apocalyptic number.

It is an amenable number.

21652405644016 is an abundant number, since it is smaller than the sum of its proper divisors (26293484171248).

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

21652405644016 is a wasteful number, since it uses less digits than its factorization.

21652405644016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5150489 (or 5150483 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 46.

The spelling of 21652405644016 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred five million, six hundred forty-four thousand, sixteen".