21655235114405 has 32 divisors (see below), whose sum is σ = 27072645223680. Its totient is φ = 16614341614080.

The previous prime is 21655235114399. The next prime is 21655235114413. The reversal of 21655235114405 is 50441153255612.

It is a happy number.

It is not a de Polignac number, because 21655235114405 - 2²⁸ = 21654966678949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 357098747 + ... + 357159383.

It is an arithmetic number, because the mean of its divisors is an integer number (846020163240).

Almost surely, 2^{21655235114405} is an apocalyptic number.

It is an amenable number.

21655235114405 is a deficient number, since it is larger than the sum of its proper divisors (5417410109275).

21655235114405 is a wasteful number, since it uses less digits than its factorization.

21655235114405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90269.

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 21655235114405 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred thirty-five million, one hundred fourteen thousand, four hundred five".