21743404 has 6 divisors (see below), whose sum is σ = 38050964. Its totient is φ = 10871700.

The previous prime is 21743341. The next prime is 21743413. The reversal of 21743404 is 40434712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2717922 + ... + 2717929.

Almost surely, 2^21743404 is an apocalyptic number.

It is an amenable number.

21743404 is a deficient number, since it is larger than the sum of its proper divisors (16307560).

21743404 is a wasteful number, since it uses less digits than its factorization.

21743404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5435855 (or 5435853 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 21743404 is about 4662.9823074938. The cubic root of 21743404 is about 279.1102881422.

The spelling of 21743404 in words is "twenty-one million, seven hundred forty-three thousand, four hundred four".