21459009105 has 16 divisors (see below), whose sum is σ = 38149349760. Its totient is φ = 11444804784.

The previous prime is 21459009097. The next prime is 21459009163. The reversal of 21459009105 is 50190095412.

It is not a de Polignac number, because 21459009105 - 2³ = 21459009097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21459009105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79477677 + ... + 79477946.

It is an arithmetic number, because the mean of its divisors is an integer number (2384334360).

Almost surely, 2^21459009105 is an apocalyptic number.

It is an amenable number.

21459009105 is a deficient number, since it is larger than the sum of its proper divisors (16690340655).

21459009105 is a wasteful number, since it uses less digits than its factorization.

21459009105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158955637 (or 158955631 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 21459009105 in words is "twenty-one billion, four hundred fifty-nine million, nine thousand, one hundred five".