21159608 has 32 divisors (see below), whose sum is σ = 41973120. Its totient is φ = 9984000.

The previous prime is 21159587. The next prime is 21159613. The reversal of 21159608 is 80695112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9128 + ... + 11208.

It is an arithmetic number, because the mean of its divisors is an integer number (1311660).

Almost surely, 2^21159608 is an apocalyptic number.

It is an amenable number.

21159608 is a deficient number, since it is larger than the sum of its proper divisors (20813512).

21159608 is a wasteful number, since it uses less digits than its factorization.

21159608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159 (or 2155 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 21159608 is about 4599.9573911070. The cubic root of 21159608 is about 276.5896167757.

The spelling of 21159608 in words is "twenty-one million, one hundred fifty-nine thousand, six hundred eight".