21652431640432 has 20 divisors (see below), whose sum is σ = 43398192728520. Its totient is φ = 10452898033088.

The previous prime is 21652431640417. The next prime is 21652431640447. The reversal of 21652431640432 is 23404613425612.

It is an interprime number because it is at equal distance from previous prime (21652431640417) and next prime (21652431640447).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23332361218 + ... + 23332362145.

It is an arithmetic number, because the mean of its divisors is an integer number (2169909636426).

Almost surely, 2^{21652431640432} is an apocalyptic number.

It is an amenable number.

21652431640432 is an abundant number, since it is smaller than the sum of its proper divisors (21745761088088).

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

21652431640432 is a wasteful number, since it uses less digits than its factorization.

21652431640432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46664723400 (or 46664723394 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 21652431640432 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred thirty-one million, six hundred forty thousand, four hundred thirty-two".