21106066 has 8 divisors (see below), whose sum is σ = 31707504. Its totient is φ = 10536900.

The previous prime is 21106051. The next prime is 21106067. The reversal of 21106066 is 66060112.

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

It is not an unprimeable number, because it can be changed into a prime (21106067) 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, 6360 + ... + 9091.

It is an arithmetic number, because the mean of its divisors is an integer number (3963438).

Almost surely, 2^21106066 is an apocalyptic number.

21106066 is a deficient number, since it is larger than the sum of its proper divisors (10601438).

21106066 is a wasteful number, since it uses less digits than its factorization.

21106066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16136.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 21106066 is about 4594.1338683151. The cubic root of 21106066 is about 276.3561267883.

Adding to 21106066 its reverse (66060112), we get a palindrome (87166178).

The spelling of 21106066 in words is "twenty-one million, one hundred six thousand, sixty-six".