21116606 has 16 divisors (see below), whose sum is σ = 36357120. Its totient is φ = 9010680.

The previous prime is 21116597. The next prime is 21116629. The reversal of 21116606 is 60661112.

It is a super-2 number, since 2×21116606² = 891822097918472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191 + ... + 6501.

It is an arithmetic number, because the mean of its divisors is an integer number (2272320).

Almost surely, 2^21116606 is an apocalyptic number.

21116606 is a deficient number, since it is larger than the sum of its proper divisors (15240514).

21116606 is a wasteful number, since it uses less digits than its factorization.

21116606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6559.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 21116606 is about 4595.2808401664. The cubic root of 21116606 is about 276.4021216039.

Adding to 21116606 its reverse (60661112), we get a palindrome (81777718).

The spelling of 21116606 in words is "twenty-one million, one hundred sixteen thousand, six hundred six".