21353606 has 16 divisors (see below), whose sum is σ = 34805760. Its totient is φ = 9788040.

The previous prime is 21353603. The next prime is 21353611. The reversal of 21353606 is 60635312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7886 + ... + 10241.

It is an arithmetic number, because the mean of its divisors is an integer number (2175360).

Almost surely, 2^21353606 is an apocalyptic number.

21353606 is a deficient number, since it is larger than the sum of its proper divisors (13452154).

21353606 is a wasteful number, since it uses less digits than its factorization.

21353606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18179.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 21353606 is about 4620.9962129394. The cubic root of 21353606 is about 277.4323336894.

Adding to 21353606 its reverse (60635312), we get a palindrome (81988918).

The spelling of 21353606 in words is "twenty-one million, three hundred fifty-three thousand, six hundred six".