21110456 has 16 divisors (see below), whose sum is σ = 39827400. Its totient is φ = 10489824.

The previous prime is 21110443. The next prime is 21110489. The reversal of 21110456 is 65401112.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6791 + ... + 9398.

Almost surely, 2^21110456 is an apocalyptic number.

It is an amenable number.

21110456 is a deficient number, since it is larger than the sum of its proper divisors (18716944).

21110456 is a wasteful number, since it uses less digits than its factorization.

21110456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16358 (or 16354 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 21110456 is about 4594.6116266775. The cubic root of 21110456 is about 276.3752858820.

Adding to 21110456 its reverse (65401112), we get a palindrome (86511568).

The spelling of 21110456 in words is "twenty-one million, one hundred ten thousand, four hundred fifty-six".