21456046 has 8 divisors (see below), whose sum is σ = 32276304. Its totient is φ = 10697280.

The previous prime is 21456007. The next prime is 21456047. The reversal of 21456046 is 64065412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21456047) 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, 14490 + ... + 15901.

It is an arithmetic number, because the mean of its divisors is an integer number (4034538).

Almost surely, 2^21456046 is an apocalyptic number.

21456046 is a deficient number, since it is larger than the sum of its proper divisors (10820258).

21456046 is a wasteful number, since it uses less digits than its factorization.

21456046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30746.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 21456046 is about 4632.0671411369. The cubic root of 21456046 is about 277.8752696844.

The spelling of 21456046 in words is "twenty-one million, four hundred fifty-six thousand, forty-six".