21404496 has 60 divisors (see below), whose sum is σ = 58776992. Its totient is φ = 6710784.

The previous prime is 21404491. The next prime is 21404503. The reversal of 21404496 is 69440412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404491) 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 in 11 ways as a sum of consecutive naturals, for example, 13101 + ... + 14643.

Almost surely, 2^21404496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29388496).

21404496 is an abundant number, since it is smaller than the sum of its proper divisors (37372496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21404496 is a wasteful number, since it uses less digits than its factorization.

21404496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 21404496 is about 4626.4993245433. The cubic root of 21404496 is about 277.6525514598.

The spelling of 21404496 in words is "twenty-one million, four hundred four thousand, four hundred ninety-six".