21232606 has 4 divisors (see below), whose sum is σ = 31848912. Its totient is φ = 10616302.

The previous prime is 21232571. The next prime is 21232639. The reversal of 21232606 is 60623212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308150 + ... + 5308153.

It is an arithmetic number, because the mean of its divisors is an integer number (7962228).

Almost surely, 2^21232606 is an apocalyptic number.

21232606 is a deficient number, since it is larger than the sum of its proper divisors (10616306).

21232606 is a wasteful number, since it uses less digits than its factorization.

21232606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616305.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21232606 is about 4607.8851982227. The cubic root of 21232606 is about 276.9073182351.

Adding to 21232606 its reverse (60623212), we get a palindrome (81855818).

The spelling of 21232606 in words is "twenty-one million, two hundred thirty-two thousand, six hundred six".