21106006 has 8 divisors (see below), whose sum is σ = 31799160. Its totient is φ = 10506288.

The previous prime is 21105977. The next prime is 21106037. The reversal of 21106006 is 60060112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22791 + ... + 23698.

It is an arithmetic number, because the mean of its divisors is an integer number (3974895).

Almost surely, 2^21106006 is an apocalyptic number.

21106006 is a deficient number, since it is larger than the sum of its proper divisors (10693154).

21106006 is a wasteful number, since it uses less digits than its factorization.

21106006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46718.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21106006 is about 4594.1273382439. The cubic root of 21106006 is about 276.3558649144.

Adding to 21106006 its reverse (60060112), we get a palindrome (81166118).

The spelling of 21106006 in words is "twenty-one million, one hundred six thousand, six".