21694006 has 8 divisors (see below), whose sum is σ = 34455240. Its totient is φ = 10208928.

The previous prime is 21693977. The next prime is 21694007. The reversal of 21694006 is 60049612.

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 (21694007) 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, 318996 + ... + 319063.

It is an arithmetic number, because the mean of its divisors is an integer number (4306905).

Almost surely, 2^21694006 is an apocalyptic number.

21694006 is a deficient number, since it is larger than the sum of its proper divisors (12761234).

21694006 is a wasteful number, since it uses less digits than its factorization.

21694006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638078.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21694006 is about 4657.6824709291. The cubic root of 21694006 is about 278.8987612457.

The spelling of 21694006 in words is "twenty-one million, six hundred ninety-four thousand, six".