21041456 has 20 divisors (see below), whose sum is σ = 41870832. Its totient is φ = 10236096.

The previous prime is 21041453. The next prime is 21041479. The reversal of 21041456 is 65414012.

It is not an unprimeable number, because it can be changed into a prime (21041453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17180 + ... + 18363.

Almost surely, 2^21041456 is an apocalyptic number.

It is an amenable number.

21041456 is a deficient number, since it is larger than the sum of its proper divisors (20829376).

21041456 is a wasteful number, since it uses less digits than its factorization.

21041456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35588 (or 35582 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21041456 is about 4587.0966852684. The cubic root of 21041456 is about 276.0738442752.

Adding to 21041456 its reverse (65414012), we get a palindrome (86455468).

The spelling of 21041456 in words is "twenty-one million, forty-one thousand, four hundred fifty-six".