21041606 has 8 divisors (see below), whose sum is σ = 31657080. Its totient is φ = 10489248.

The previous prime is 21041599. The next prime is 21041609. The reversal of 21041606 is 60614012.

It is a happy number.

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 (21041609) 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, 14936 + ... + 16283.

It is an arithmetic number, because the mean of its divisors is an integer number (3957135).

Almost surely, 2^21041606 is an apocalyptic number.

21041606 is a deficient number, since it is larger than the sum of its proper divisors (10615474).

21041606 is a wasteful number, since it uses less digits than its factorization.

21041606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31558.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21041606 is about 4587.1130354505. The cubic root of 21041606 is about 276.0745002973.

Adding to 21041606 its reverse (60614012), we get a palindrome (81655618).

The spelling of 21041606 in words is "twenty-one million, forty-one thousand, six hundred six".