21704944 has 20 divisors (see below), whose sum is σ = 42631696. Its totient is φ = 10703232.

The previous prime is 21704941. The next prime is 21704957. The reversal of 21704944 is 44940712.

It is a super-2 number, since 2×21704944² = 942209188086272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21704941) 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, 8124 + ... + 10459.

Almost surely, 2^21704944 is an apocalyptic number.

It is an amenable number.

21704944 is a deficient number, since it is larger than the sum of its proper divisors (20926752).

21704944 is a wasteful number, since it uses less digits than its factorization.

21704944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18664 (or 18658 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21704944 is about 4658.8565120639. The cubic root of 21704944 is about 278.9456264504.

The spelling of 21704944 in words is "twenty-one million, seven hundred four thousand, nine hundred forty-four".