21626606 has 4 divisors (see below), whose sum is σ = 32439912. Its totient is φ = 10813302.

The previous prime is 21626599. The next prime is 21626621. The reversal of 21626606 is 60662612.

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

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, 5406650 + ... + 5406653.

It is an arithmetic number, because the mean of its divisors is an integer number (8109978).

Almost surely, 2^21626606 is an apocalyptic number.

21626606 is a deficient number, since it is larger than the sum of its proper divisors (10813306).

21626606 is a wasteful number, since it uses less digits than its factorization.

21626606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10813305.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 21626606 is about 4650.4414844184. The cubic root of 21626606 is about 278.6096295003.

The spelling of 21626606 in words is "twenty-one million, six hundred twenty-six thousand, six hundred six".