21106775059 has 4 divisors (see below), whose sum is σ = 21107235616. Its totient is φ = 21106314504.

The previous prime is 21106775029. The next prime is 21106775083. The reversal of 21106775059 is 95057760112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21106775059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21106775029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152859 + ... + 256084.

It is an arithmetic number, because the mean of its divisors is an integer number (5276808904).

Almost surely, 2^21106775059 is an apocalyptic number.

21106775059 is a deficient number, since it is larger than the sum of its proper divisors (460557).

21106775059 is an equidigital number, since it uses as much as digits as its factorization.

21106775059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460556.

The product of its (nonzero) digits is 132300, while the sum is 43.

The spelling of 21106775059 in words is "twenty-one billion, one hundred six million, seven hundred seventy-five thousand, fifty-nine".