21424748 has 6 divisors (see below), whose sum is σ = 37493316. Its totient is φ = 10712372.

The previous prime is 21424699. The next prime is 21424759. The reversal of 21424748 is 84742412.

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, 2678090 + ... + 2678097.

It is an arithmetic number, because the mean of its divisors is an integer number (6248886).

Almost surely, 2^21424748 is an apocalyptic number.

It is an amenable number.

21424748 is a deficient number, since it is larger than the sum of its proper divisors (16068568).

21424748 is a wasteful number, since it uses less digits than its factorization.

21424748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5356191 (or 5356189 counting only the distinct ones).

The product of its digits is 14336, while the sum is 32.

The square root of 21424748 is about 4628.6875029537. The cubic root of 21424748 is about 277.7400914325.

The spelling of 21424748 in words is "twenty-one million, four hundred twenty-four thousand, seven hundred forty-eight".