21738400020535 has 8 divisors (see below), whose sum is σ = 28457541845136. Its totient is φ = 15809745469440.

The previous prime is 21738400020529. The next prime is 21738400020569. The reversal of 21738400020535 is 53502000483712.

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

It is not a de Polignac number, because 21738400020535 - 2³⁵ = 21704040282167 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, 197621818314 + ... + 197621818423.

It is an arithmetic number, because the mean of its divisors is an integer number (3557192730642).

Almost surely, 2^{21738400020535} is an apocalyptic number.

21738400020535 is a deficient number, since it is larger than the sum of its proper divisors (6719141824601).

21738400020535 is a wasteful number, since it uses less digits than its factorization.

21738400020535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395243636753.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 21738400020535 in words is "twenty-one trillion, seven hundred thirty-eight billion, four hundred million, twenty thousand, five hundred thirty-five".