21445006 has 8 divisors (see below), whose sum is σ = 35091864. Its totient is φ = 9747720.

The previous prime is 21444979. The next prime is 21445013. The reversal of 21445006 is 60054412.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 974773 = 21445006 / (2 + 1 + 4 + 4 + 5 + 0 + 0 + 6).

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 3 ways as a sum of consecutive naturals, for example, 487365 + ... + 487408.

It is an arithmetic number, because the mean of its divisors is an integer number (4386483).

Almost surely, 2^21445006 is an apocalyptic number.

21445006 is a deficient number, since it is larger than the sum of its proper divisors (13646858).

21445006 is a wasteful number, since it uses less digits than its factorization.

21445006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974786.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21445006 is about 4630.8752952331. The cubic root of 21445006 is about 277.8276021678.

Adding to 21445006 its reverse (60054412), we get a palindrome (81499418).

The spelling of 21445006 in words is "twenty-one million, four hundred forty-five thousand, six".