21606604650055 has 4 divisors (see below), whose sum is σ = 25927925580072. Its totient is φ = 17285283720040.

The previous prime is 21606604650031. The next prime is 21606604650061. The reversal of 21606604650055 is 55005640660612.

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

It is not a de Polignac number, because 21606604650055 - 2¹⁵ = 21606604617287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21606604649987 and 21606604650014.

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, 2160660465001 + ... + 2160660465010.

It is an arithmetic number, because the mean of its divisors is an integer number (6481981395018).

Almost surely, 2^{21606604650055} is an apocalyptic number.

21606604650055 is a deficient number, since it is larger than the sum of its proper divisors (4321320930017).

21606604650055 is an equidigital number, since it uses as much as digits as its factorization.

21606604650055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4321320930016.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 21606604650055 in words is "twenty-one trillion, six hundred six billion, six hundred four million, six hundred fifty thousand, fifty-five".