21109006 has 8 divisors (see below), whose sum is σ = 31758480. Its totient is φ = 10522848.

The previous prime is 21108977. The next prime is 21109007. The reversal of 21109006 is 60090112.

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 (21109007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14986 + ... + 16333.

It is an arithmetic number, because the mean of its divisors is an integer number (3969810).

Almost surely, 2^21109006 is an apocalyptic number.

21109006 is a deficient number, since it is larger than the sum of its proper divisors (10649474).

21109006 is a wasteful number, since it uses less digits than its factorization.

21109006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31658.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 21109006 is about 4594.4538304351. The cubic root of 21109006 is about 276.3689580013.

Adding to 21109006 its reverse (60090112), we get a palindrome (81199118).

The spelling of 21109006 in words is "twenty-one million, one hundred nine thousand, six".