21454504 has 32 divisors (see below), whose sum is σ = 41328000. Its totient is φ = 10438272.

The previous prime is 21454483. The next prime is 21454541. The reversal of 21454504 is 40545412.

It is a happy number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 52252 + ... + 52660.

It is an arithmetic number, because the mean of its divisors is an integer number (1291500).

Almost surely, 2^21454504 is an apocalyptic number.

It is an amenable number.

21454504 is a deficient number, since it is larger than the sum of its proper divisors (19873496).

21454504 is a wasteful number, since it uses less digits than its factorization.

21454504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 21454504 is about 4631.9006897817. The cubic root of 21454504 is about 277.8686127584.

Adding to 21454504 its reverse (40545412), we get a palindrome (61999916).

The spelling of 21454504 in words is "twenty-one million, four hundred fifty-four thousand, five hundred four".