21104255577177 has 8 divisors (see below), whose sum is σ = 31265563818080. Its totient is φ = 14069503718100.

The previous prime is 21104255577133. The next prime is 21104255577191. The reversal of 21104255577177 is 77177555240112.

21104255577177 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 4 + 2 + 55 + 577 + 17 + 7 = 666.

It is not a de Polignac number, because 21104255577177 - 2⁷ = 21104255577049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21104255577107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390819547699 + ... + 390819547752.

It is an arithmetic number, because the mean of its divisors is an integer number (3908195477260).

Almost surely, 2^{21104255577177} is an apocalyptic number.

21104255577177 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21104255577177 is a deficient number, since it is larger than the sum of its proper divisors (10161308240903).

21104255577177 is an equidigital number, since it uses as much as digits as its factorization.

21104255577177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781639095460 (or 781639095454 counting only the distinct ones).

The product of its (nonzero) digits is 4802000, while the sum is 54.

The spelling of 21104255577177 in words is "twenty-one trillion, one hundred four billion, two hundred fifty-five million, five hundred seventy-seven thousand, one hundred seventy-seven".