21009596 has 12 divisors (see below), whose sum is σ = 37014600. Its totient is φ = 10434000.

The previous prime is 21009587. The next prime is 21009613. The reversal of 21009596 is 69590012.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17030 + ... + 18221.

It is an arithmetic number, because the mean of its divisors is an integer number (3084550).

Almost surely, 2^21009596 is an apocalyptic number.

It is an amenable number.

21009596 is a deficient number, since it is larger than the sum of its proper divisors (16005004).

21009596 is a wasteful number, since it uses less digits than its factorization.

21009596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35404 (or 35402 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 21009596 is about 4583.6225848121. The cubic root of 21009596 is about 275.9344344712.

The spelling of 21009596 in words is "twenty-one million, nine thousand, five hundred ninety-six".