21508089107 has 4 divisors (see below), whose sum is σ = 22443223440. Its totient is φ = 20572954776.

The previous prime is 21508089101. The next prime is 21508089133. The reversal of 21508089107 is 70198080512.

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

It is a cyclic number.

It is not a de Polignac number, because 21508089107 - 2¹⁴ = 21508072723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21508089101) 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, 467567132 + ... + 467567177.

It is an arithmetic number, because the mean of its divisors is an integer number (5610805860).

Almost surely, 2^21508089107 is an apocalyptic number.

21508089107 is a deficient number, since it is larger than the sum of its proper divisors (935134333).

21508089107 is an equidigital number, since it uses as much as digits as its factorization.

21508089107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935134332.

The product of its (nonzero) digits is 40320, while the sum is 41.

The spelling of 21508089107 in words is "twenty-one billion, five hundred eight million, eighty-nine thousand, one hundred seven".