21404048 has 10 divisors (see below), whose sum is σ = 41470374. Its totient is φ = 10702016.

The previous prime is 21404029. The next prime is 21404063. The reversal of 21404048 is 84040412.

It can be written as a sum of positive squares in only one way, i.e., 16875664 + 4528384 = 4108^2 + 2128^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 668861 + ... + 668892.

Almost surely, 2^21404048 is an apocalyptic number.

It is an amenable number.

21404048 is a deficient number, since it is larger than the sum of its proper divisors (20066326).

21404048 is a wasteful number, since it uses less digits than its factorization.

21404048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337761 (or 1337755 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 21404048 is about 4626.4509075532. The cubic root of 21404048 is about 277.6506143401.

It can be divided in two parts, 2140404 and 8, that added together give a palindrome (2140412).

The spelling of 21404048 in words is "twenty-one million, four hundred four thousand, forty-eight".