21601677005455 has 4 divisors (see below), whose sum is σ = 25922012406552. Its totient is φ = 17281341604360.

The previous prime is 21601677005443. The next prime is 21601677005459. The reversal of 21601677005455 is 55450077610612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21601677005455 - 2⁵ = 21601677005423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21601677005399 and 21601677005408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601677005459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2160167700541 + ... + 2160167700550.

It is an arithmetic number, because the mean of its divisors is an integer number (6480503101638).

Almost surely, 2^{21601677005455} is an apocalyptic number.

21601677005455 is a deficient number, since it is larger than the sum of its proper divisors (4320335401097).

21601677005455 is an equidigital number, since it uses as much as digits as its factorization.

21601677005455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320335401096.

The product of its (nonzero) digits is 1764000, while the sum is 49.

The spelling of 21601677005455 in words is "twenty-one trillion, six hundred one billion, six hundred seventy-seven million, five thousand, four hundred fifty-five".