21459009085 has 8 divisors (see below), whose sum is σ = 26870411520. Its totient is φ = 16420806864.

The previous prime is 21459009083. The next prime is 21459009097. The reversal of 21459009085 is 58090095412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21459009085 - 2¹ = 21459009083 is a prime.

It is a super-2 number, since 2×21459009085² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21459009083) 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 in 7 ways as a sum of consecutive naturals, for example, 93299925 + ... + 93300154.

It is an arithmetic number, because the mean of its divisors is an integer number (3358801440).

Almost surely, 2^21459009085 is an apocalyptic number.

It is an amenable number.

21459009085 is a deficient number, since it is larger than the sum of its proper divisors (5411402435).

21459009085 is a wasteful number, since it uses less digits than its factorization.

21459009085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186600107.

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 21459009085 in words is "twenty-one billion, four hundred fifty-nine million, nine thousand, eighty-five".