21632320444565 has 8 divisors (see below), whose sum is σ = 25958953791648. Its totient is φ = 17305743516880.

The previous prime is 21632320444541. The next prime is 21632320444573. The reversal of 21632320444565 is 56544402323612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21632320444565 - 2²⁰ = 21632319395989 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 13256687 + ... + 14798796.

It is an arithmetic number, because the mean of its divisors is an integer number (3244869223956).

Almost surely, 2^{21632320444565} is an apocalyptic number.

It is an amenable number.

21632320444565 is a deficient number, since it is larger than the sum of its proper divisors (4326633347083).

21632320444565 is a wasteful number, since it uses less digits than its factorization.

21632320444565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28209699.

The product of its (nonzero) digits is 4147200, while the sum is 47.

The spelling of 21632320444565 in words is "twenty-one trillion, six hundred thirty-two billion, three hundred twenty million, four hundred forty-four thousand, five hundred sixty-five".