21404848 has 10 divisors (see below), whose sum is σ = 41471924. Its totient is φ = 10702416.

The previous prime is 21404843. The next prime is 21404857. The reversal of 21404848 is 84840412.

It is not an unprimeable number, because it can be changed into a prime (21404843) 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, 668886 + ... + 668917.

Almost surely, 2^21404848 is an apocalyptic number.

It is an amenable number.

21404848 is a deficient number, since it is larger than the sum of its proper divisors (20067076).

21404848 is a wasteful number, since it uses less digits than its factorization.

21404848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337811 (or 1337805 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 21404848 is about 4626.5373661087. The cubic root of 21404848 is about 277.6540734634.

The spelling of 21404848 in words is "twenty-one million, four hundred four thousand, eight hundred forty-eight".