21106606 has 32 divisors (see below), whose sum is σ = 34992000. Its totient is φ = 9509472.

The previous prime is 21106583. The next prime is 21106607. The reversal of 21106606 is 60660112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117825 + ... + 118003.

It is an arithmetic number, because the mean of its divisors is an integer number (1093500).

Almost surely, 2^21106606 is an apocalyptic number.

21106606 is a deficient number, since it is larger than the sum of its proper divisors (13885394).

21106606 is a wasteful number, since it uses less digits than its factorization.

21106606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336.

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

The square root of 21106606 is about 4594.1926385384. The cubic root of 21106606 is about 276.3584836310.

Adding to 21106606 its reverse (60660112), we get a palindrome (81766718).

It can be divided in two parts, 21106 and 606, that added together give a palindrome (21712).

The spelling of 21106606 in words is "twenty-one million, one hundred six thousand, six hundred six".