21696044 has 6 divisors (see below), whose sum is σ = 37968084. Its totient is φ = 10848020.

The previous prime is 21696041. The next prime is 21696079. The reversal of 21696044 is 44069612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21696044.

It is not an unprimeable number, because it can be changed into a prime (21696041) 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 as a sum of consecutive naturals, namely, 2712002 + ... + 2712009.

It is an arithmetic number, because the mean of its divisors is an integer number (6328014).

Almost surely, 2^21696044 is an apocalyptic number.

It is an amenable number.

21696044 is a deficient number, since it is larger than the sum of its proper divisors (16272040).

21696044 is a wasteful number, since it uses less digits than its factorization.

21696044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5424015 (or 5424013 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 21696044 is about 4657.9012441227. The cubic root of 21696044 is about 278.9074945010.

The spelling of 21696044 in words is "twenty-one million, six hundred ninety-six thousand, forty-four".