21456106 has 8 divisors (see below), whose sum is σ = 36781920. Its totient is φ = 9195468.

The previous prime is 21456103. The next prime is 21456107. The reversal of 21456106 is 60165412.

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

It is not an unprimeable number, because it can be changed into a prime (21456103) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 766276 + ... + 766303.

It is an arithmetic number, because the mean of its divisors is an integer number (4597740).

Almost surely, 2^21456106 is an apocalyptic number.

21456106 is a deficient number, since it is larger than the sum of its proper divisors (15325814).

21456106 is a wasteful number, since it uses less digits than its factorization.

21456106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532588.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21456106 is about 4632.0736177224. The cubic root of 21456106 is about 277.8755287023.

The spelling of 21456106 in words is "twenty-one million, four hundred fifty-six thousand, one hundred six".