21606140085 has 24 divisors (see below), whose sum is σ = 36138222624. Its totient is φ = 11022258720.

The previous prime is 21606140071. The next prime is 21606140137. The reversal of 21606140085 is 58004160612.

It is not a de Polignac number, because 21606140085 - 2⁴ = 21606140069 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1353511 + ... + 1369380.

It is an arithmetic number, because the mean of its divisors is an integer number (1505759276).

Almost surely, 2^21606140085 is an apocalyptic number.

It is an amenable number.

21606140085 is a deficient number, since it is larger than the sum of its proper divisors (14532082539).

21606140085 is a wasteful number, since it uses less digits than its factorization.

21606140085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722945 (or 2722922 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 21606140085 in words is "twenty-one billion, six hundred six million, one hundred forty thousand, eighty-five".