21456118 has 8 divisors (see below), whose sum is σ = 32419512. Its totient is φ = 10649616.

The previous prime is 21456107. The next prime is 21456131. The reversal of 21456118 is 81165412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38880 + ... + 39427.

It is an arithmetic number, because the mean of its divisors is an integer number (4052439).

Almost surely, 2^21456118 is an apocalyptic number.

21456118 is a deficient number, since it is larger than the sum of its proper divisors (10963394).

21456118 is a wasteful number, since it uses less digits than its factorization.

21456118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78446.

The product of its digits is 1920, while the sum is 28.

The square root of 21456118 is about 4632.0749130384. The cubic root of 21456118 is about 277.8755805058.

The spelling of 21456118 in words is "twenty-one million, four hundred fifty-six thousand, one hundred eighteen".