21744704 has 14 divisors (see below), whose sum is σ = 43149774. Its totient is φ = 10872320.

The previous prime is 21744631. The next prime is 21744727. The reversal of 21744704 is 40744712.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 1960000 = 4448^2 + 1400^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169817 + ... + 169944.

Almost surely, 2^21744704 is an apocalyptic number.

It is an amenable number.

21744704 is a deficient number, since it is larger than the sum of its proper divisors (21405070).

21744704 is an equidigital number, since it uses as much as digits as its factorization.

21744704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339773 (or 339763 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 21744704 is about 4663.1217011783. The cubic root of 21744704 is about 279.1158505363.

The spelling of 21744704 in words is "twenty-one million, seven hundred forty-four thousand, seven hundred four".