21104255577191 has 2 divisors, whose sum is σ = 21104255577192. Its totient is φ = 21104255577190.

The previous prime is 21104255577133. The next prime is 21104255577239. The reversal of 21104255577191 is 19177555240112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21104255577191 - 2¹⁰ = 21104255576167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104255577131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552127788595 + 10552127788596.

It is an arithmetic number, because the mean of its divisors is an integer number (10552127788596).

Almost surely, 2^{21104255577191} is an apocalyptic number.

21104255577191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104255577191 is an equidigital number, since it uses as much as digits as its factorization.

21104255577191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882000, while the sum is 50.

The spelling of 21104255577191 in words is "twenty-one trillion, one hundred four billion, two hundred fifty-five million, five hundred seventy-seven thousand, one hundred ninety-one".