21456116 has 24 divisors (see below), whose sum is σ = 41111616. Its totient is φ = 9717120.

The previous prime is 21456107. The next prime is 21456131. The reversal of 21456116 is 61165412.

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, 14105 + ... + 15551.

It is an arithmetic number, because the mean of its divisors is an integer number (1712984).

Almost surely, 2^21456116 is an apocalyptic number.

It is an amenable number.

21456116 is a deficient number, since it is larger than the sum of its proper divisors (19655500).

21456116 is a wasteful number, since it uses less digits than its factorization.

21456116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799 (or 1797 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 21456116 is about 4632.0746971525. The cubic root of 21456116 is about 277.8755718719.

The spelling of 21456116 in words is "twenty-one million, four hundred fifty-six thousand, one hundred sixteen".