21193696 has 24 divisors (see below), whose sum is σ = 44180640. Its totient is φ = 9973248.

The previous prime is 21193691. The next prime is 21193727. The reversal of 21193696 is 69639112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21193691) 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, 18936 + ... + 20023.

It is an arithmetic number, because the mean of its divisors is an integer number (1840860).

Almost surely, 2^21193696 is an apocalyptic number.

It is an amenable number.

21193696 is an abundant number, since it is smaller than the sum of its proper divisors (22986944).

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

21193696 is a wasteful number, since it uses less digits than its factorization.

21193696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38986 (or 38978 counting only the distinct ones).

The product of its digits is 17496, while the sum is 37.

The square root of 21193696 is about 4603.6611517356. The cubic root of 21193696 is about 276.7380651521.

The spelling of 21193696 in words is "twenty-one million, one hundred ninety-three thousand, six hundred ninety-six".