21601696 has 24 divisors (see below), whose sum is σ = 45031140. Its totient is φ = 10165248.

The previous prime is 21601693. The next prime is 21601703. The reversal of 21601696 is 69610612.

It can be written as a sum of positive squares in 2 ways, for example, as 18490000 + 3111696 = 4300^2 + 1764^2 .

It is not an unprimeable number, because it can be changed into a prime (21601691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19311 + ... + 20398.

Almost surely, 2^21601696 is an apocalyptic number.

It is an amenable number.

21601696 is an abundant number, since it is smaller than the sum of its proper divisors (23429444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21601696 is a wasteful number, since it uses less digits than its factorization.

21601696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39736 (or 39728 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 21601696 is about 4647.7624724162. The cubic root of 21601696 is about 278.5026188396.

The spelling of 21601696 in words is "twenty-one million, six hundred one thousand, six hundred ninety-six".