21344806 has 8 divisors (see below), whose sum is σ = 36591120. Its totient is φ = 9147768.

The previous prime is 21344803. The next prime is 21344821. The reversal of 21344806 is 60844312.

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 (21344803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762301 + ... + 762328.

It is an arithmetic number, because the mean of its divisors is an integer number (4573890).

Almost surely, 2^21344806 is an apocalyptic number.

21344806 is a deficient number, since it is larger than the sum of its proper divisors (15246314).

21344806 is a wasteful number, since it uses less digits than its factorization.

21344806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524638.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21344806 is about 4620.0439391850. The cubic root of 21344806 is about 277.3942177230.

The spelling of 21344806 in words is "twenty-one million, three hundred forty-four thousand, eight hundred six".